I've never done it before, but there are videos. You use a special diamond bit on a regular drill. Putty is usually smeared on the area to make a dam to keep a small amount of water on the drill site, and the glass is well supported. Other than that, it's about like using a hole saw to drill wood. Large scale fish keepers commonly drill for overflows and filtration so water changes on all the tanks can be automated.Originally Posted by kevall1
Yes, the bottom pane could be removed (big hassle, however), and acrylic inserted, but one would have still have to drill the hole. Also, silicone doesn't stick to acrylic (plexy - don't know) as well as it sticks to glass (acrylic tanks are glued together differently). I'd want things reliably water tight for a planted tank, which is why I'd choose a glass tank to begin with. I would just find a couple of suitable plumbing pvc fittings/gasget to line the cut hole, and make a short stand-up pipe to serve as a barrier to keep the substrate from falling down.
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