How do I plug holes in the floor of a glass tank??

[benmorrow1978]

I'm looking for suggestions on how to plug the drilled holes in the bottom of my 70G tall tank. I'm making a FOWLR for the little lady for Christmas, but I need to plug the holes originally drilled for a sump. No need to tell me about the benefits of a sump, I know them.

I've read that with glass, I have to place a new piece in the floor, as if that's the only option. If it is, do I have to pull out the original? Can I just layer another piece over and silicone it in? How thick would it need to be?

Has anyone done this? I've read I could use bulkheads as well, again with lots of silicone. The holes are on the floor plate, so neatness isn't exactly necessary as the plugs will be covered with substrate.

Tell me what you have done! Thanks!

[Reefing Madness]

Easiest fix is your bulkhead idea. I'm not sure if you can use a piece of glass and silicone it in place over the hole like you can acrylic. I know silicone bonds glass, so if you think about it, why would it not bond a peice to the bottom? But, i have not talked with anyone who has done it with glass, so I know that the bulk heads are an easy fix.

[chrisfont23]

Threaded cap, rubber gasket and (threaded bulkhead). No need for anything else. I do this with my in ground sprinklers and that's a lot more pressure.