How close? Bottom drill reef tank

Maximitsurugi

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Hi guys. Because of where this new tank will be, I can’t do an external overflow. Basically, I’ll be replicating a Fiji Cube 48 but I want to do an internal corner overflow on the long side.

I want to go as slim but as safe as possible on the internal weir. I’m gonna be using 2 X 1inch bulkheads and 1 X 3/4 bulkhead for return.

1.How close can I have them drill to the edge of the glass at the bottom?

2. How close can the 3 holes be?

The tank is gonna be built out of 10mm glass.
Thanks in advance.
P.S. If anyone knows the spacing of the holes for like the Fiji Cube 81 internal overflow, that’s be good as a template. There’s an example in the pic.

5F03F674-C57E-4301-9C33-D58E35CCDF06.jpeg
 
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