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Discussion Starter · #1 ·
I'm making an overflow box for my 125 and was wanting to know how big of teeth should I cut in it to achieve about 1500gph flow rate. Maybe 1/4" wide by 3/4" deep?
 

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how big is the overflow box?are you going to have 2 1" drains out the bottom?1500gph is quite a bit of water.i would start with what your thinking but you could always open up the holes if you need more.
 

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Discussion Starter · #4 ·
The overflow is 12" long 6" deep and 2" wide. I am going to install 2 1 1/2 bulkheads straight from the overflow box through the back of the tank and to the sump filter. any suggestions on how big the teeth should be?
 
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