Thanks for all the quick responses.
I'm probably going to go the patch route, using half inch thick glass to match the tank bottom thickness.
There is a third option but It might be a half assed way to do it, reduce the size of the overflow box and install an L-shaped coast to coast overflow, so I can use the two holes in the bottom and then only have to drill one additional hole in the back for the third drain, for a bean animal style.
so I would have a smaller corner overflow with a larger coast to coast style perched on top of it.
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