Thanks, I'll either put in the pvc with holes or on a piece of glass. But i have another problem, my tank is 3 ft wide with 2 pieces of glass on each end, my penguin 350 and my aquaclear 110 cover about the entire surface, so the overflow might have to be modified to fit over one of the filters, or over and around one of the glass peices, but would this work?
Today I just figured out that my "75" is really a 90 gallon tank, so would a 18 gallon tubberware still be fine.