Ok so I just made two 3 sided overflow boxes for my tank. The boxes measure 8x3...they will be toothless. This should provide more than enough flow for the 100 gallon.

Real question is....how far above the "rim" of the overflow will the water rise? Should I glue these on directly level with the bottom of the upper trim? This will leave no gap, but might make the water so high that it hights the center brace.

So knowing how far the water rill rise over the edge of the overflow would really be a valuable tidbit of information....any help?


P.S. With 11 inches of linear area per overflow and no teeth, I'm guesing the water won't rise more than perhaps an eigth of an inch over the edge.....