[tang daddy]

As others have said, get a new drilled 20g then you can rescape or run an overflow that is worthy, I was looking at the design of some of the overflows and some needed an aqualifter pump to prime and suck the air out, too much tinkering, I like the drilled overflow method, although saying this my next tank will have a coast to coast external overflow so I don't have an ugly box in the tank, also it will have 3 drains because you can't have too many safety in the hobby....