– Algae scrubber: A device used to manually remove algae from the aquarium glass or other surfaces.

– Amazon sword: A type of aquatic plant native to the Amazon Basin, known for its large leaves and ability to thrive in various water conditions.

– Anemone: A marine invertebrate often kept in saltwater aquariums, known for its striking appearance and symbiotic relationship with clownfish and other fish.

– Angelfish: A popular freshwater fish species known for its elegant shape, vibrant colors, and flowing fins.

– Auto top-off: An automated system that adds water to the aquarium to compensate for evaporation.


– Bacterium: Microscopic organisms that play a crucial role in the aquarium’s biological filtration by breaking down harmful substances.

– Biorb: A brand that offers stylish and spherical aquariums, often made of acrylic and equipped with filtration systems.

– Blackwater: A type of aquarium setup that mimics natural habitats with dark, tea-colored water, typically achieved by adding leaves or botanicals.

– Bladder snail: A small and commonly found freshwater snail that can reproduce rapidly and help in keeping the aquarium clean by consuming algae and detritus.

– Brackish water: Water that has a salinity level between freshwater and seawater, suitable for certain fish species and invertebrates.


– Cabomba: A popular freshwater aquarium plant with feathery, light-green leaves that provides shelter for fish and helps oxygenate the water.

– Caudal fin: The tail fin of a fish, responsible for propulsion and steering.

– Cherry barb: A small schooling fish native to Sri Lanka, prized for its vibrant red coloration and peaceful nature.

– Coldwater aquarium: An aquarium setup that maintains a lower temperature range suitable for coldwater fish species like goldfish or certain native fish.

– CO2 injector: A device used to add a controlled amount of carbon dioxide to the aquarium water, promoting healthy plant growth.


– Diatom filter: A type of filter that uses a powdery substance called diatomaceous earth to mechanically remove fine particles, impurities, and algae from the water.

– Discus fish: A highly prized freshwater fish species known for its vibrant colors, round shape, and demanding care requirements.

– Drip acclimation: A method used to slowly acclimate newly acquired fish or invertebrates to the water parameters of their new aquarium by slowly dripping water from the tank into their transport bag.

– Dutch aquarium: A style of aquascaping characterized by lush and meticulously arranged aquatic plants, often inspired by the Dutch masters’ paintings.

– Dwarfcichlid: Small and colorful freshwater fish from the Cichlidae family, known for their peaceful nature and suitability for smaller aquariums.


– Echinodorus: A genus of aquatic plants commonly known as sword plants, featuring tall and broad leaves that serve as hiding places and add visual appeal to the aquarium.

– Egg-layers: Fish species that reproduce by laying eggs, which usually require specific conditions or additional care for successful hatching.

– Eutrophic: A condition in which an aquarium or body of water becomes nutrient-rich, often leading to excessive algae growth and increased risk of oxygen depletion.

– External filter: A type of filter that is positioned outside the aquarium, drawing water through an inlet hose and returning it through an outlet hose after filtration.

– Eyelash catfish: A small and peaceful species of catfish known for its long and delicate whiskers, resembling eyelashes.


– Fishless cycling: A method of establishing the biological filtration in an aquarium by using ammonia or equivalent substances, without introducing live fish, to initiate the nitrogen cycle.

– Flake food: Dry fish food available in flake form, commonly used as a staple diet for a wide range of freshwater and marine fish species.

– Floating plants: Aquatic plants that naturally float on the water’s surface, providing shade, shelter, and added filtration for the aquarium.

– Foxtail: A submerged aquarium plant belonging to the Ceratophyllum genus, characterized by its fine, feathery leaves and fast growth rate.

– Freshwater: Water with low salinity content, typically found in rivers, lakes, and ponds, used as the main type of water in freshwater aquarium setups.


– Giant gourami: A large and aggressive species of gourami, known for its size and the territorial nature displayed by males.

– Glofish: Genetically modified zebrafish that exhibit bright fluorescent colors under blue light, adding a vibrant touch to freshwater aquariums.

– Golden snail: A small and attractive snail species often kept in aquariums, known for its bright golden-yellow shell.

– Good bacteria: Beneficial bacteria that colonize the aquarium’s filter media, substrate, and other surfaces to convert harmful compounds into less toxic forms, aiding in water quality.

– Green terror: A large and aggressive cichlid species known for its vibrant, greenish-blue coloration and strong territorial behavior.


– Hang-on-back refugium: A secondary compartment attached to the back of the aquarium that acts as a habitat for small organisms, promoting biodiversity and providing additional filtration.

– Harlequin rasbora: A small and peaceful schooling fish native to Southeast Asia, featuring a striking pattern of orange, black, and silver scales.

– Heater controller: A device used to regulate and maintain the desired water temperature in the aquarium, providing added precision and safety.

– Hydrometer: A tool used to measure the salinity level in saltwater or brackish water aquariums, helping to ensure optimal conditions for marine fish and invertebrates.

– Hydroponics: A cultivation method where plants grow without soil, often implemented in aquarium setups to further enhance water filtration and nutrient uptake.


– In-tank filter: A type of filter that is installed directly inside the aquarium, typically used for small tanks or breeding setups, providing mechanical and biological filtration.

– Internal parasites: Microscopic organisms that can infect fish internally, causing diseases such as ich, velvet, or internal worms.

– Invertebrate-specific food: Specially formulated food designed to meet the dietary needs of invertebrates, such as shrimp, snails, or crabs, providing essential nutrients for their health and growth.

– Ich treatment: Interventions and medications used to combat ichthyophthiriasis, a common parasitic disease characterized by white spots on fish.

– Incandescent lighting: Traditional lighting technology that uses a filament to produce light, typically used in older aquariums or for low lighting needs.


– Jack Dempsey: A popular and dynamic species of cichlid native to Central America, known for its vibrant colors and aggressive behavior.

– Java moss: A common aquatic plant often used in aquariums for its hardiness, versatility, and ability to create dense, mossy carpets or provide hiding places for fry and small fish.

– Jellyfish tank: A specialized aquarium designed for keeping jellyfish as pets, featuring circular flow patterns and special filters to mimic their natural environment.

– Jump guard: A protective mesh or lid placed on top of the aquarium to prevent fish from jumping out and to keep out unwanted debris or pests.

– Juvenile: Referring to young or not fully mature fish, typically before they reach their adult coloration, size, or reproductive stage.


– Kalkwasser: A calcium hydroxide solution used in marine or reef aquariums to maintain calcium and alkalinity levels, supporting coral growth and skeleton development.

– Killifish: A diverse group of small freshwater fish known for their vibrant colors, unique breeding behaviors, and adaptability to different water conditions.

– Kissing gourami: A species of gourami with a peculiar mouth shape that allows the fish to “kiss” or lock lips during courtship or dominance displays.

– Koi pond: An outdoor pond specifically designed to house and showcase koi fish, often meticulously landscaped and equipped with advanced filtration systems.

– Kuhli loach: A slender, eel-like fish belonging to the genus Pangio, known for its nocturnal behavior and intricate patterns.


– Labyrinth fish: Fish species characterized by the presence of a labyrinth organ, which allows them to breathe atmospheric air directly from the water’s surface.

– Livebearer: Fish species that give birth to fully developed fry rather than laying eggs, including popular species like guppies, mollies, and platies.

– Ludwigia: A genus of aquatic plants often used in aquariums for their vibrant colors and ability to grow both submerged and emersed.

– Lyretail: A variety of fish characterized by a long, flowing tail fin that resembles the shape of a lyre.


– Mangrove: A type of plant commonly found in saltwater aquariums, known for its unique root system and its ability to absorb excess nutrients from the water.

– Microorganism: Tiny organisms, such as bacteria and protozoa, that play important roles in the aquarium ecosystem, including decomposition, nutrient cycling, and biological filtration.

– Mystery snail: A popular freshwater snail often kept in aquariums, known for its unique shell patterns and its ability to help control algae growth.

– Mysis shrimp: Small, freshwater or marine shrimp often used as a nutritious food source for fish and invertebrates.

– Melanistic: Referring to a genetic mutation that causes an excess of dark pigmentation, resulting in a darker appearance compared to the wild-type coloration.


– Nana plant: A popular variety of the Anubias genus, known for its small size and dense, dark-green leaves.

– Nano aquarium: An aquarium specifically designed for small spaces and usually holding 10 gallons or less of water, ideal for desktops or limited living spaces.

– Nematode: Small, worm-like organisms commonly found in aquarium substrates, performing essential roles in nutrient cycling.

– Nitrogen cycle: The biological process in which nitrifying bacteria convert fish waste and decaying matter into less toxic compounds, including ammonia, nitrite, and nitrate.

– Nudibranch: A colorful and fascinating group of marine snails often kept in saltwater aquariums, known for their intricate patterns and unique shapes.


– Open-top aquarium: An aquarium setup that lacks a traditional lid or cover, leaving the top exposed, allowing for better gas exchange and evaporation.

– Optimum pH: The ideal range of acidity or alkalinity in the aquarium water, depending on the specific requirements of the fish and plants being kept.

– Otocinclus: A small and peaceful catfish species often used in aquariums to control algae growth, known for its sucker-like mouth and ability to clean surfaces.

– Ozone generator: A device used to introduce ozone (O3) into the aquarium water, aiding in the breakdown of organic waste and improving water quality.

– Osmosis: The natural process of water moving through semi-permeable membranes, often used in reverse osmosis systems to purify tap water.


– Planted tank: An aquarium specifically designed and set up to showcase and cultivate a variety of aquatic plants, creating a natural and visually appealing environment.

– Powerhead: A device that creates water movement in the aquarium, promoting oxygenation, preventing dead zones, and aiding in filtration.

– Python water changer: A popular brand of gravel siphon and water changing system, commonly used to remove debris and perform regular water changes in aquariums.

– pH buffer: Substances added to the aquarium water to help stabilize and maintain the desired pH level, providing a more stable environment for fish and other organisms.

– Parrot cichlid: A hybrid freshwater fish species often characterized by its bright, vibrant colors and unique body shape, created by selectively breeding different cichlid species.


– Quarantine tank: A separate aquarium used to isolate and monitor new fish or sick fish, minimizing the risk of introducing diseases or parasites into the main display tank.

– Quick-start bacteria: Commercially available live bacteria products used to jump-start the nitrogen cycle in a newly set up aquarium or during routine maintenance.

– Quinine sulfate: A medication used to treat certain freshwater fish diseases, such as ich, velvet, and external parasitic infections.

– Queen angelfish: A beautiful and colorful marine fish species known for its striking blue and yellow coloration, commonly found in tropical reefs.

– Quick-release valve: A device used in air pumps or CO2 systems to regulate and control the flow of air or gas into the aquarium.


– Reef aquarium: A specialized saltwater aquarium designed to simulate the conditions of a coral reef, often populated with live corals, invertebrates, and fish.

– Refugium: A separate chamber within the aquarium or sump that provides a safe haven for organisms, such as macroalgae and copepods, contributing to biodiversity and nutrient control.

– Rainbowfish: A family of small to medium-sized freshwater fish known for their vibrant colors, active behavior, and peaceful nature.

– Ram cichlid: A dwarf species of cichlid originating from South America, prized for its brilliant colors, intricate patterning, and peaceful disposition.

– Redox potential: A measure of the overall oxidative or reduction potential in the aquarium, indicating the balance between oxidized and reduced substances in the water chemistry.


– Sump: An additional aquarium or chamber placed below the main display tank, often used to house equipment, provide additional water volume, and enhance filtration.

– Substrate: The material or mixture placed at the bottom of the aquarium to provide a base for plants, fish, and invertebrates, such as gravel, sand, or specialized aquatic soil.

– Swordtail: A popular livebearing fish species known for its distinct sword-shaped tail fin, available in various color variations and patterns.

– Sarasa comet: A type of goldfish characterized by its bright red and white coloration and long, flowing tail fin, often seen in outdoor garden ponds.

– Siphon: A tube or device used to remove water or debris from the aquarium, typically used during regular water changes or for cleaning purposes.


– Test kit: A set of chemical reagents or testing strips used to measure and monitor various water parameters, such as pH, ammonia, nitrite, nitrate, and more in the aquarium.

– Tetra: A large and diverse family of freshwater fish, known for their small size, vibrant colors, and peaceful nature, including popular species like neon tetra and cardinal tetra.

– Tannins: Organic compounds that are released from decaying leaves, wood, or botanicals in the aquarium, often resulting in a tea-colored appearance of the water.

– Top-dweller: Fish species that primarily inhabit and swim near the water surface, often seen gulping air or consuming floating food.

– Trigon 350: A specific model of a corner aquarium manufactured by Juwel, known for its unique shape and generous water capacity.


– Ultraviolet sterilizer: A device that utilizes UV light to control the population of harmful microorganisms, such as parasites, bacteria, and algae in the aquarium water.

– Undergravel filter: A type of filtration system consisting of a perforated plate or grid at the bottom of the aquarium, allowing water to flow through the substrate and promoting beneficial bacterial growth.

– Urologist: An aquatic veterinary professional specializing in the diagnosis and treatment of fish and other aquatic animals.

– Upside-down catfish: A species of catfish that displays an unusual habit of swimming upside-down, known for its peaceful nature and unique appearance.

– Upwelling system: A circulation device that creates an upward water flow in the aquarium, enhancing water movement and promoting efficient filtration.


– Valisneria: A genus of aquatic plants often used in aquariums, known for its long, ribbon-like leaves and ability to grow tall, providing shelter and spawning sites for fish.

– Veiltail: A variety of fish characterized by long, flowing fins and tail, often seen in bettas, goldfish, and angelfish varieties.

– Volcanic rock: A type of rock formed from solidified lava or magma, commonly used as a decorative element in aquariums due to its unique appearance and porous nature.

– Vacation feeder: A specialized fish food designed to slowly dissolve and release small amounts of nutrients over a longer period, providing nutrition for fish when their owners are away.

– Vibrant supplement: A commercial liquid solution containing various compounds designed to maintain optimal water quality and promote coral health in reef aquariums.


– Wavemaker: A device that generates waves or regular water flow in the aquarium, simulating natural water movement and enhancing oxygenation.

– Wild-caught: Fish or other aquatic organisms that have been sourced directly from their natural habitats rather than being bred in captivity.

– Whisper filter: A type of hang-on-back power filter produced by the Tetra brand, known for its quiet operation and efficient filtration.

– Wisteria: A popular and fast-growing aquatic plant species often used in aquariums, known for its graceful appearance and the ability to remove excess nutrients from the water.

– Wet/dry filter: A type of filtration system that combines mechanical, biological, and chemical filtration, utilizing both wet and dry media for enhanced water purification.


– Xenia: A soft coral frequently seen in reef aquariums, which showcases a unique pulsating movement and comes in various color forms.

– Xiphophorus: A genus of livebearing fish species, including popular varieties like platies and swordtails, known for their vibrant colors and ease of breeding.

– Xylem: Tissue in plants that transports water and nutrients from the roots to the leaves, contributing to plant growth and survival.

– X-ray tetra: A small and peaceful freshwater fish species native to South America, known for its transparent body that reveals the internal organs, resembling an X-ray image.

– Xenopus: A genus of aquatic frogs often kept in specialized amphibian tanks or paludariums, known for their unique appearance and ability to survive in both water and on land.


– Yellowtail damselfish: A small and hardy marine fish species known for its bright yellow coloring and territorial behavior, commonly found in reef aquariums.

– Yokohama guppy: A variety of guppy selectively bred for its striking colors, metallic sheen, and elaborate finnage.

– Yellow tang: A popular and vibrant marine fish species endemic to Hawaii, commonly kept in saltwater aquariums due to its bright yellow coloration and active swimming behavior.

– Yabby: A species of freshwater crustacean often kept in aquariums or small ponds, similar to crayfish or freshwater lobsters, known for their burrowing behavior and long claws.

– Yashia goby: A small and peaceful fish species native to Southeast Asia, often kept in pairs or small groups in saltwater aquariums, known for their intricate patterns and interesting behaviors.


– Zebra pleco: A highly sought-after and rare catfish species primarily found in the Xingu River in Brazil, known for its beautiful black-and-white striped appearance.

– Zipper loach: A small and active loach species known for its distinctive color pattern resembling a zipper-like stripe along its body, often kept in small groups for their social behavior.

– Zetlight: A popular brand that offers a range of aquarium lighting solutions, including LEDs and other innovative technologies.

– Zoonotic disease: A disease that can be transmitted between animals and humans, highlighting the importance of proper hygiene, handling, and quarantine practices in the aquarium hobby.

– Zoisite: A type of rock or crystalline mineral often used as a decorative element in aquariums, known for its various colors and attractive patterns.