drilling the tank

[superchargedgp]

okji have 60 cube rimless with cornver overflow. it had durso setup, that I am tired of messing with. the tank cant be moved, its fully stocked. I would like to run a herbie setup. did anyone drill a tank from the inside of overflow?

the idea is to keep the livestock inside the tank and pumps on. drain the overflow completely, remove all the pipes and bulk heads. drill the back of the tank from the inside of the overflow. I would build a jig for the holesaw and use right angle drill.
could it work?

 

[zoomcorvette]

It should work if you can keep the bit wet while it is cutting to keep the temp down, just be prepared if it cracks.

 

[anarchy]

It won't look as nice but you could run a pipe over the back of the tank as the return and not take the risk of cracking the tank. And it will take no time to make