Overflow Question

[intarsiabox]

Seems like drilling a hole in the pipe above the sump water line did the trick (So far). Thanks for the suggestion! Both Durso's are are the same height but one has about double the length of pipe to flow through to get to the sump. The one with the longer line has given me no problems but I also have a ball valve on it that directs some water into my refugium that I haven't tried out yet.