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Originally Posted by Samw
If you want to set up a sump, you can but you still need to place the water return above the water surface in order to prevent the surface scum from forming.
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I don't believe that at all.......I have no returns above the water cause I don't like the sound of it......and I have never had scum on the water top......If your gonna go with a sump then all you need us enough water turn over to keep them scum away from the surface.....so in other words take the size of you water volume...Multiply it by 4 or 5 and that's how much turn over you will need!!!
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500G Mixed Reef
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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin