Like I said two is ideal, but you only have an 80g. The only tank I had two drains on was my 180. Never had a flood yet. A stockman standpipe has several holes in it, and a cover over the top of them, the chances of anything blocking it are very slim if done right. and if you use your return as a second drain, they will be right beside each other and if by some reason a large bubbletip or something gets in there, it could very well plug both anyways. If you are set on a second drain, I would go with one in the opposite corner, but be aware that the overflow is going to take up another 6"x6" of tank space. How big diameter is the drain you have?
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