Drilling Established Tank

[wingedfish]

run the air line into a powerhead, that way when the powerhead quits, at least you won't lose your siphon.

drilling the tank shouldn't be an issue if your sure the glass is not tempered, and your sure you can do it. put a rag on the inside to catch any glass dust. you'll have to trickle water over your cut and have a way to catch it.