I have a 125g fowlr tank and a 55g fuge. I made two 3/4" pvc overflows. I bought a mag drive 9.5 for my return. I used 1.5" pvc for my return. It is also T into my fuge section on the sump with a ball valve. My overflows seem to be way too slow. and there is alot of gurgling noise from the over flows. If i open the ball valve on the return no water flows to the DT, it all goes to the fuge. If i shut it off enough for water flow to the tank it emptys the sump faster then it fills. Should i have used different pipes? or did i do something wrong? any help really appreciated thanks!!