Hi Cartman I have 2 Hand on the Back refugiums and they both work great. I dont think I could have gotten a protien skimmer,Refuge pump, skimmer pump and main tank pump all in my sump I went to two sumps to have dedicated food sorces for my pair of Mandrin Fish and Leopard Wrasses I wanted to be able to have a great big Nursery of copods and ampiopods for them to eat as i have not been able to get them to eat any prepared food My smaller one is a CPR model and i also have a great big EcoSystems Mirical mud refugium I leave the lights on both of them all the time this seems to work the best hope this helps...Jeff
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whati was trying to ask is can u make a combo sump refug or is it better to have seperate and also what about those hang on the back refugiums are they any good