Return Bulkhead so deep?

[Squiddy]

Thanks again for the replies. I don't think I am going to go and redo the overflow box now... I went through enough hell getting the tank set up at our current house (floor was very uneven, rubbermaid containing livestock while tank was being leveled started leaking all over the carpet etc).

I am going go try lowering the standpipe first to see what that does. When I had the pump opened right up, I could look down the top of the standpipe and it sure looked like there was plenty of room for that much water going down there. I think the problem is that more room is needed above the opening to the standpipe in order for that much water to drain due to surface tension probably?

I will also take your suggestions and put a couple of 45's or 90's on the output of that bulkhead to bring the line up to the surface before attaching any locline.

We'll see how that goes I guess. Thanks again guys.