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If its skimmed, charcoaled and chemically filtered it may not be the best for a clam. Clams use dissolved organics in the water as fertalizer for their zoxanthelle and if your filtration is as efficent as it sounds their growth might be stunted. I am not however saying that a clam is a fix to a nutrient problem or that they can be used to justify being lax in your water quaility, since the amount of nitrates that they use is barley discernable.
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