My overflow drain has gas

[outtafocus]

I really appreciate the help everyone has given me.
Thanks for the tip on the stand pipe idea,Tony, it will work so if nothing else I can do that. (I am about to try it out anyway)

Since I am new to the overflow/sump idea I knew I would make some mistakes, but this has been really frustrating. I feel bad because I was taking it out on my girlfriend. I was in the middle of trying different hole combinations and she called and I wasnt exactly the most talkative guy. OOPS.

I figured this was the one thing in reef aquariums where the science was exact, or at least everyone agreed. Water flows over glass, water enters standpipe, water falls to sump, easy right? Wrong.

Thanks