Opinions please

[Vandyfan13]

Have you drilled glass before?

In small scales yes but not on something so large

 

[Vandyfan13]

Internal coast to coast with overflow on both ends on the back side if I was viewing from only oneong side of the tank.

I've seen a video of pvc coast to coast and it looked really cool

 

[duanes]

Glass is easy to drill, and the thicker it is, the easier it is because it doesn't crack with the slightest move.
The only tanks I've drilled that cracked with thin glass. Half inch or over were almost foolproof..
If you have riverine fish you may want to drill overflows on one end, and have returns on the other.. But not a necessity.

 

[Bigfishnut]

I like to use a block of 3/4" plywood for a guide and a bulkhead gasket under it to help hold water. Lay a towel under so the slug doesn't chip the panel below. Glass is very easy to drill, just take your time and let the drill do the work.

 

[Fish Tank Travis]

Glass is easy to drill, and the thicker it is, the easier it is because it doesn't crack with the slightest move.
The only tanks I've drilled that cracked with thin glass. Half inch or over were almost foolproof..
If you have riverine fish you may want to drill overflows on one end, and have returns on the other.. But not a necessity.

I agree. I drilled my 220 with about 5/8" glass and it went very well. It took a while to get 5 holes in it but I got them all done.

 

[duanes]

I do the same as biggish nut, and drill a hole in the plywood to send a stream of water to the drill, for tanks that I drill while standing, and or partially full.