Tropical Fish Glossary

An aquarium style focused on aquatic plant layouts. Using CO2 injection, high-intensity lighting, and nutrient-rich substrate, it creates a beautiful underwater garden. Also known as a Nature Aquarium.

The process of dissolving CO2 into aquarium water to boost plant photosynthesis. Methods include pressurized cylinders and DIY yeast fermentation. It significantly improves plant growth rate and coloration, though dosing must be carefully adjusted.

A sealed filtration unit installed outside the tank. It offers large media capacity and high filtration performance. In planted tanks, it has the advantage of minimizing CO2 off-gassing, making it the standard choice for medium to large aquariums.

A granular substrate made from baked soil, ideal for aquatic plants. It comes in nutrient-rich and absorption types, both promoting strong root growth. It naturally lowers pH to slightly acidic levels, creating water conditions suitable for most tropical fish.

The process of gradually matching the temperature and water chemistry between the bag water and the tank water when introducing new fish. Typically done over 30–60 minutes using the drip method after temperature matching, it prevents shock and death upon introduction.

Adding new fish, shrimp, or other creatures to an aquarium. This should only be done after the tank has cycled and water parameters are stable. Adding too many at once can overwhelm the filter and degrade water quality, so gradual introduction is recommended.

A small livebearer from Central and South America and one of the most iconic tropical fish. Males are known for their colorful tail fins, and selective breeding has produced many varieties. Easy to breed and popular with beginners, though overpopulation can be a concern.

A common name for small tropical fish in the Characidae family. Neon Tetras and Cardinal Tetras are the most popular species, admired for their beautiful schooling behavior. Their peaceful temperament makes them excellent tank mates, and they pair wonderfully with planted tanks.

A popular catfish species from South America, loved for the charming way it rummages through the substrate. Often called the 'tank janitor' because it feeds on leftover food at the bottom. Keeping them in groups encourages more active and natural behavior.

Keeping multiple fish species together in the same tank. Compatibility must be considered based on temperament, water parameter preferences, and size differences. Peaceful small species generally coexist well.

The initial process of filling a new tank, running the filter, and establishing beneficial bacteria. It typically takes 2–4 weeks for the nitrogen cycle (ammonia → nitrite → nitrate) to become fully established.

An intermediate substance produced when bacteria break down ammonia. It is toxic to fish and tends to spike during the early stages of tank cycling. Further bacterial processing converts it into relatively harmless nitrate.