Imma confused!
Do you have internal or external overflows? The bottom of the tank is drilled?
What is the total linear length of overflow that the water goes over?
If it's internal overflow, what are the dimensions of the box? Is there room to drill one more hole?
As for the guy who decided to swiss cheese the bottom of his tank, I'd put money on the fact that he:
a. drilled the holes too close together
b. drilled them too close to the edge
c. overtightened the bulkheads
d. all of the above
I've got the 1-3/4" hole saw here in front of me if you want to use it. I'm working at home all day today (or rather, supposed to be working), so you can come by at any time. I'm in the afternoon and evening tomorrow as well.
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