I have about a 3 1/2" Derasa clam on the bottom of my 100g tank located about 22" or so under a 175W True10K MH bulb. It appears dark blue. It dosent appear to have the yellow or org. areas common to these clams. I understand that putting it up higher on the rocks is a no no for this species and that they prefer the sandbed. Any ideas? Or, is this all perfectly normal and fine?????
Dennis



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