Now I need overflow help

[TheReefGeek]

hmmmm, putting a ball valve on your drain line certainly isn't an ideal solution.

Is there any adjustment at the top of the standpipe? With a durson you vary the size of the whole at the top for air, and that adjusts the height of the water, perhaps you could do something similar to raise the water level, instead of chocking your drain line.

Have you tried putting a piece of air line into the drain line to stop the gurgling?

You could also try a durso to compare the two systems, they are CHEAP and quick to build.