enough lighting for a clam

I have 2 clams in my 55 at the bottom of the tank. See my lghting below. It's not just the lighting. Parameters MUST be right.
 
clams

clams

under 2" clams need supplemental feeding of phytoplankton in addition to lighting.If they are larger than 2" they are mainly photosynthetic and just require lighting.You lighting is sufficient for clams,but your water chemistry does need to be in safe perimeters.Adding additives is a must too.
 
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