I know people have sumps for saltwater tanks, because you can put live rock and have a protein skimmer in there, and it won't take up room in your display tank. Would it be too excessive to have a sump for a freshwater tank? I am purchasing a 55 gallon next month, which I know isn't even that large. But I'm really attracted to the idea of having small (10 gallon?) sump for this tank, because from what I understand, it's an automatic top-off, and easier on water changes, and I can just store a wet/dry filter in there. Correct me if I'm wrong. Do people do this, or should I just use a regular filter? Also, since it's for a freshwater tank, I wouldn't need a protein skimmer or anything... so would my sump need to have any compartments? I've only read about and seem plans for saltwater tanks. So a freshwater sump would be really simple to build I think, but can someone tell me if I'm thinking along the right lines?
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