Hi, I just bought a used Kent Nautilus TE skimmer for my 55 gallon (main) and 20 gallon (sump). So far, it's not skimming all too well. Lots of water, but isn't real black and foamy. The pump is a Sedra (pushes about 500 gph). Are there any mods that I can do on this to make it perform better? Thanks!!!



