There is no set "design" for sumps but most people tend to go for a 3 chamber sump Skimmer chamber, Refugium chamber,return pump....this is by no means a setup for you to follow you could do a 2 chamber sump skimmer and return .....the choice is strictly yours the only thing is that regardless what you decide to do the sump should be large enough to handle excess water in case of a power failure or pump failure. Nothing worse than coming home to wet floors
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 My aquarium is nothing but a smorgasbord for my cats.....
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