I used an overflow box that I got off ebay and it gurgled. I got it resolved and thought I might share the solution that worked. The issue that I had was a cyclone would periodically develop and slurp all the water from the box before it builds up again.
I first put in a filter pad to buffer it which worked but I was worried that when the pad gets some debris in it it might overflow the box onto the floor.
After some experimentation I found that a $.35 piece of what I think is cross stitching plastic works great. I just cut a section, rolled it up and stuffed it in the bulkhead fitting. It keeps the cyclone from starting and just about silences the box