Complete Tropical Fish Care Guide

Building the right aquarium

Tropical fish care is primarily about creating a stable aquatic environment suited to the species. RSPCA recommends choosing an appropriately sized aquarium, using a filter, maintaining suitable temperature with a thermostatically controlled heater and testing water rather than judging quality by appearance. OATA similarly stresses that ammonia and nitrite should be zero and that species-specific water requirements must be considered.

Water quality and temperature

A new aquarium should be fishless cycled before fish are added. This allows beneficial bacteria to establish in the filter and helps prevent dangerous ammonia and nitrite spikes. Stocking should be based on the adult size, behaviour, social needs and water requirements of the chosen species rather than on the size of fish when purchased. Shoaling fish may need groups, while some species are territorial or aggressive.

Feeding, compatibility and maintenance^★

Feeding should be controlled so food is consumed promptly without creating unnecessary waste. Regular testing and partial water changes form part of routine maintenance. Fish should be acclimatised carefully when introduced, and equipment such as heaters and filters^★ should be checked regularly. Tropical fishkeeping is a long-term commitment, so the aquarium should be planned around the adult fish and their welfare needs before any purchase is made.