overflow box problems

Hi Iam looking for some advice on my overflow box weir. I had a custom
acylic tank made by clairty plus. 200 gallons. L shaped tank and wanted
the overflow box to be in the corner of the L. But I never told them how
big of a overflow box I wanted. Well its to small I can only pump 900gph
over the weir that is max anymore I will overfill the tank. The water
level in the tank at this rate is very high. My question is can I cut
or knock out some of the teeth at the top of the overflow box. To
increase flow. Would love any help thanks jimmy


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jamgabby