Housing & Environment Guide

1. What it is and what it covers

Aquarium housing and environment provide the water, space, filtration, temperature, lighting and shelter fish need.

2. Key facts and specifications

RSPCA recommends aquariums larger than 45 x 30 x 30cm (about 40 litres), with larger volumes generally more stable. It recommends effective filtration, weekly water changes and regular ammonia/nitrite testing.

3. Practical guidance

Fishless-cycle a new aquarium, monitor water quality and maintain a stable temperature. Tropical fish need a thermostatically controlled heater.

4. Suitability, choices and limitations

Tank requirements vary greatly by species and whether the system is freshwater or marine.

5. UK-specific considerations

UK guidance requires temperature to remain within appropriate species ranges and changes to occur gradually.

6. Safety, risks and cautions

Never rely on clear-looking water as proof of safety. Test water and correct poor parameters promptly.

7. Current sources and research

Current RSPCA guidance was used for aquarium environment, water quality, fish health, feeding and compatibility. Current GOV.UK ornamental-fish licensing guidance was used for UK terminology and welfare requirements for tropical freshwater and tropical marine fish.