Bulit in overflow question

The amount that the water will rise over the bottom of your slots will depend on the amount of flow going through the return. on my 90 gallon I was about a 1/4" below the top of my "fingers" until I added another pump........ then it went to the top.. I just rebuilt my overflow and made my slots 1" deep....... they were about 3/4" before........... haven't tested it yet...

Dan

So is this just a crap shoot? will a gph of 700 be enough to rise above 3/4 a inch to hide the waterline? My slots are 1.5 deep with the frame covering 7/8ths of a inch if i cut it to mate with the top frame.

Overflow

When I set up my 90 I had the same problem, you could see the water line just below the top molding. What I did to help the situation was to remove the sponge around the mag drive since it is in it's own compartment of the fuge. Helped raise it a bit and didn't cost anything. It was still a hair low, but now that is has been running the build up of algae and such has decreased the sloth depth a little and the level is perfect. You never see the water line.