Marineland 45 cube

[yzquadracer]

Has anyone ever drilled the back pain on a 45 gal cube? Wanting to add a third bulkhead for an emergency overflow

 

[jagr200]

Are they tempered?

 

[yzquadracer]

I can't tell, the tank is 2 years old

 

[MikeandNicole]

I drilled mine, used the gh kit