Drilling glass-how close is too close.

Plumber · May 3, 2007

I have a 20g that I want to drill. How close to the top frame can I get without it cracking? It's 3/16" glass.

Plumber · May 3, 2007

Can anyone help?

Volenti · May 4, 2007

I would want to keep at least 1/2'' away from the edge, but glass can be a fickle and unforgiving mistress.

Wolf3101 · May 4, 2007

Thinner glass is more difficult to drill and more likely to be tempered. You might want to talk to a local glass shop.

cjohll · May 4, 2007

why do do want to drill so close to the top?

Plumber · May 4, 2007

cjohll;842019; said:
why do do want to drill so close to the top?

I came across 6 of these 29g tanks and I'm thinking about a breeding system with flow-thru filtration.

Dark Helion · May 17, 2007

You can drill lower, say 2" from the top, then use an upward-facing elbow to keep the water level still high.

portabuddy · May 17, 2007

^^^ i was just about to sugest that

, i would actuly drill the botom and have one sticking upwards...

WeeNe858 · May 17, 2007

yeah it works out better if you had a standpipe to take the water.... you reduce he amount of elbows and bends and its slightly easier to maintain

gomezladdams · May 17, 2007

Too close to the top and youll have to trim the plastic frame to get the bulkhead in.