2'x2' would be the dimensions. Thanks for the ideas. Although the DIY one may not be aesthetically pleasing it seems functional. Ill check out the light diffusers first.
Lowes or home depot. just got one made for my 30 for an experiment im doing in the tank. honestly its not too bad to look at. just a 1/4" line in the middle of the tank.
We also use the egg crate stuff for dividers. Our own special touch is to use fishing line to sew plastic screening over the dividers because we're using them in breeder tanks and we don't want the fry to be able to pass through the dividers. Works great!