I agree with MOLIKEN, need actinics. I am running 6 , 5 foot T-5's. 3 true actinic, 2 blue plus and 1 fiji purple and have no problems with my clams or growth. Grant it they like to move around and like the sand bed better than the rocks because I am using what is called Bermuda Pink Sand which is small ground up shells and not find sand so they have plenty to grab of shells and such to adhere there foot to. 6 of my 8 (both M and C's) live in the shell sand base.
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