I want to find out where people are setting their return line for the auto-top off. So my issue is that the water line in my refill water bucket is higher than my sump. After the water is topped off in my sump, the water continues to siphon from the water bucket. I was considering having the top off tube line fill in the main tank, but the overflow is not draining quick enough and will overflow the tank main tank. Can someone let me know what other options I have?