I pretty much agree with what everyone else here is saying. What ever you have room for for any given applications is fine. It is just a place to put unsightly equiptment and to increase water volume. "The solution to pollution is dilution" I have always done custom sumps, even the oceanic i got from you I cut their baffle out and put my own design in. It gives you the oppurtunity to set your own water levels and chamber sizes to what is required for your specific equiptment.
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