Is there room for a third hole in this overflow?

[Velcro]

Picking up a used frag tank this weekend. I do not have measurements in this box yet, just this picture. Eyeballing this, do you think there's enough room for another 1" bulkhead or would it be too close to the existing one?

 

[NowGlazeIT]

It looks like the one in the middle is dead center so yea. I don’t know about 1 inch but what ever the size of the return looks like it would fit

 

[NowGlazeIT]

When drilling next to an edge don’t drill closer then the thickness of your glass. Or it will get sketchy haha