I think you would have problems with a clam, but if you want some really good feedback try posting your question on the Tridacnid Clam.. forum. There are allot of people on that forum who could answer you question and help you out.
Derasas and Squamosas will do just fine in that size tank with those lights. I've had my Derasa for almost two years and kept him under the same lights in question. No problems. I will agree that if you want a Crocea you will need higher intense light.
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