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Tridacna: brilliant color in the good light, no coral compares with it.
Drawbacks:
- it grow big and reasonably fast;
- if the turf algae takes a hold on the shell, removing it is almost impossible, IMHE; (NO3, PO4 = 0)
- they don't want be where you like them to be. Mine orients itself across the flow, for a some reason;
- watch for bristle worms, if clam starts decline - protect it;
- they cough, if the particles of fine food are in the water. May drop itself from the perch, repeatedly.
In peaceful environment - real beauties.
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