Drilling Established Tank

[Aquattro]

I'm a pretty reckless person, and I'm not sure I'd drill a tank that had water in it. If it went bad, it would be real bad

[cale262]

I've considered it but haven't tried it ...yet, here's a video of someone else doing it though.

http://www.youtube.com/user/DrGonzoR.../1/OlaOl-dBniI

[Dez]

I've done it before with a 150 g. Worked well. Had the overflow built ahead of time. Then drilled it with it 1/3 full. Then silicones the overflow in. Refilled the tank up to the level of the new overflow, then ran it with powerheads while the silicone cured overnight, then refilled it after plumbing the new
Overflow. Hope this helps.

[2pts]

I've never done a tank with water in it but I have drilled 1 unsuccessful hole, then had the glass re cut and drilled 3 successfull holes.

I bought my glass hole saw from princess auto. The hole that cracked the glass... I drilled with the hole saw and the centre drill bit that came with the mandrell http://www.princessauto.com/workshop...ories/list-all

The drill bit was not turning perfectly level, once the centre bit broke through, the glass cracked.

Second time round I removed the centre drill bit, and used a piece of plywood with 3 pre-drilled holes the size and place i wanted to drill on the glass. I also had a piece of plywood on the inside to help prevent chipping and "busting" through on the other side. I clamped them together on either side of the glass (already siliconed in place in the aquarium) I drilled 3 holes in a row like this with no issue. I also had a cold water hose trickling on the spot I was drilling the whole time.

[mark]

and if tempered