Hi everyone. So I recently completed a week long leak test on a 75 gallon. Now when I started vacuuming the water back out with my water changer the water got low and then the water stopped going through the tube and into the sink. I think it has something to do with the leverage because the 75 is on the floor and it wont suction the lower the water got. It's like it does not have enough umph to make it up the tube and into the sink.