Thinking about getting a clam...help please.

Honestly, I don't think that's enough light to sustain a clam.

I'm sure others will chime in. But I waited and didn't put one in my 14g BC. I've now got MH's on another tank and am now comfortable to add a clam.
 
I don't think you could keep a clam in there either with that lighting, definately not a crocea or maxima gigas would be to big squammy probably to big as well and even then the lighting probably isn't enough, that only leaves a derasa and I don't think they would be to peachy keen with just pc lighting.
 
I have to agree with everyone else. I've got 3 clams under T5 doing great. I'd love to put one in my 46 tank but it's only got 2X96 watt PCs. Not enough lighting.
 
i believe the derasa is found at a slightly greater depth but both grow to large for your tank. ( 2' - 4' )
 
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