crocea,maxima,squamosa,hippopus,gigas,derasa. but in reality they all have the same lighting requirements,it's just that gigas,hippopus and derasa retain there hetertrophic ability,where as the others rely on there zoo solely for there food.
the more colorful the clams mantle, the more light demanding it is.
Deresas and Squamosas generally have brownish colored mantles and are sand dwelling clams.....they do not demand as much light as other tridacna clams
Gigas clams demand quite a bit of light. I don't know where you read that they are the least demanding. It is also generally excepted that croceas and maximas, the rock dwelling tridacna clams, demand the most intense lighting.
I have a friend running pc lighting on a 75 gal and he has two crocea clams. Both with great color and both have shown great growth over the last year. He tried two maximas and both did not do very well. He took them back to the lfs before they died.
fishypets, I'm really surprised any of those clams are still alive, do the croceas hyperextend their mantles? if so then they're not happy...
also, to the original question, I've found that gold maximas need less light than blue ones, and overall croceas seem to need more light to retain color than maximas, in my experience
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