Um im at work right now but ill try to get the dimensions tonight, its a 20 long, I like the skimmer before the fuge. Its a coral life skimmer. As far as the bubble trap goes we werent sure so we just threw em in there and they worked, adjusted water level, etc. I have my skimmer hanging on the side of my sump to help out a little with space. Also like Built pointed out, how big is your tank. I have a 55 gallon and im running the mag 5 with a ball valve and a eshopps 300 overflow, adjusted the valve a little and they run good together.