Care guide
Caring for giant clams and anemones
This guide covers Maxima clam and the other species that need the same care. Ask the seller about anything particular to Maxima clam.
- Kind
- Clam or anemone
- Adult size
- About 20 cm
- Smallest tank
- 200 litres
- Water temperature
- 24–27 °C
- Salinity
- 1.023–1.026 SG
- Temperament
- Peaceful
- Reef safe
- Yes
- Care level
- Advanced
- Where they come from
- Usually aquacultured
- CITES
- Appendix II
Giant clams and anemones get much of their food from light, through algae living in their tissue. They need strong lighting, mature, stable tanks and experienced care.
Light and placement
Place clams on rock or sand under strong reef lighting, where they won't be shaded. Anemones wander until they find a spot they like; cover pump intakes so they aren't hurt.
Water
Keep calcium, alkalinity and magnesium stable for clams. Add these only to a tank that's been running well for six months or more.
CITES
Giant clams are listed on CITES Appendix II; most sold today are aquacultured. Anemones sold by hobbyists are usually split from captive anemones.
Further reading
General information to help you prepare, not veterinary advice. Every animal is different: ask an experienced vet about yours. Reviewed by PerfectPal on November 3, 2026.