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Originally Posted by KrazyKuch
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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I mentioned later on that I forgot my system is reversed from the typical system. I don't have an overflow in my main tank thus you can see the surface scum from my pic. I didn't make that up. Basically, I'm saying that I made a mistake in my first post because my main tank IS like a typical SUMP and my sump is like the typical main tank.