Whiirly this will be for my 29 gallon so my guess is that it will be to large. However I may be able to use the one from my 75 for my 29 and the one you have for my 75.. do you think that would work, or will it still be to large for a 75?
If it helps, I used a CPR CS150 (rated for 1600gph) on a 75 for 6 months without issue. I used a mag9.5 for a return pump so after head pressure was probably only pushing 700 gph through the overflow.
I think space and return pump gph are your limiting factors here. As long as you have the space both inside and behind the tank and enough drain capacity to handle your return pump (the CS150 had a single 1.5 inch drain) you should be fine with whatever you put on there.
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