| Being that my system is a little different than most (see gallery) I have the advantage of having two sumps & a refugium. The refugium gravity feeds to the main tank, So the pre-filter tank acts as a sediment/sump. From what I have read about the crypt zone filters need low flow & the 32gal pre-filter tank (where I was thinking of putting the clam) has about 1200 GPH going through it!
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Doug
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