I agree, that is the best case scenario, having a smaller tank plumbed with the big tank .... I think I may be able to sit the 40 on top of the sump of my big tank (sump is a 125 gallon tank), and have one of those small "portable" overflows, that aren't permanently siliconed to the tank, and have it dump water into the 125, with a small return pump moving water from the 125 back in .... using this method I probably won't need any filtration at all since the big tank would do it all .... I think this is probably what I'll do
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