Do I need to drill to install an overflow?

[SoloSuperman]

I’m working on drawing up some ideas for a 60 gal hex I acquired. There are no holes drilled currently, and I’m trying to figure out the overflow. Do I need to drill the tank for this or are there options for a no-drill overflow?

 

[S-t-r-e-t-c-h]

There are hang on back overflow boxes that operate on a siphon. Lifereef is supposed to have one of the better models.

After ruining a wood floor with multiple overflows using that system, I'd never use one again. IMO, drilling will be the better option...

 

[SoloSuperman]

Understood. Just scared to drill the glass. I have diamond bits, but I’d hate to break it...

 

[madweazl]

I used the hang-on overflows for the better part of 20 years and never had an issue with them (outside of being a bit noisy but a "gurglebuster" helped in that regard quite a bit). With that said, drilling the glass on our 75g was so easy I was bummed I hadnt done it sooner.

 

[ca1ore]

Hang on overflows are just so 2005. As long as the tank isn’t tempered grinding holes isn’t hard. Use plenty of water to cool the bit and take your time.