completing a sump


Medium Fish
Dec 30, 2007
North fort myers,florida
I purchased a 125gal sw tank about a year ago.It has a built in flow box and the water goes into a sump under the tank.The sump has 2 drilled holes in the top half where the water comes in from the tank.There is nothing else in the tank itself.I have the pumps in there to send the water back up into the tanks and a protein skimmer also in the tank.It just seems like something is missing like a piece of glass or divider in the tank.I do get alot of bubbles.Can someone help me with this and tell me what I am missing and how to set this up correctly