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that looks like it was built by glasscages.
personally, i think 2 holes was too much. you would have been fine with one hole that fits a 1" bulkhead, or 1.5" bulkhead to be safer.
the reason i say this is you wont be able to put much flow through that overflow anyways based on those 2 tiny holes on top for the overflow. thats were your limiting flow factor is most likely going to be. not sure how big the holes are, but i cant see more than 600gph making it through (if not less).
what is the size of the tank? and sizes of all those holes?
glasscages is just a company that makes odd sized tanks out of glass.......just looks like their style of building with all the glass reinforcing panels in the sides and bracing around the top, and the glass overflow......you dont see too many places build tanks like that.
www.glasscages.com
no idea what kind of glass that is, but i would hope its just standard glass........by enlarging that area for the overflow, i'm not sure how that may impact the strength of the tank.....maybe someone else here has a better idea.
Wow, you built that?!? Awesome.