I just got a 90g tank and 30g sump used. I am so confused on the sump set up. My 60g tank I have no doesnt have a sump. I was trying to fill the main tank today to the black strip on top and it started overflowing the sump onto the floor. I really cannot find videos or anything. It looks like it would be set up properly but I dont understand why I cant fill my tank to below the black strip on top. Also I assume water should visinly be flowing through the sump but its not. Only where the pvc pipe meets the filter sock. The pump is only connected to one hose. Not really sure if I even have it connected to the right port.