I have a 90 gallon reef tank with a 20 gal
long sump. The section were I have the return pump is not large. We copies sump from our LFS
. I currently have a rio 1100 in it but I don't think It is enough. The tank water looks and test fine but the water in the refugium part of the tank looks very stagnate and is barely moving. There is water returning to the tank. Any advise is welcome. Thanks.