i have already put the weedblocker on top of my false bottom so the substrate wont fall through and if you take a look at the picture in my previous post, i let the eggcrate on the sides of my false bottom go up alittle higher then the top of the false bottom. i will cover this up with greatstuff to conseal it. This will act as alittle lip so the substrate doesnt fall into the water as my animals crawl in and out of it. i used greatstuff on the sloping banks to hide the egg crate. now that i think of it , it was kind of pointless to have used eggcrate on the sides of my false bottom because i just covered them up with greatstuff anyway. i could have just used styrofoam for the sides and skipped that whole step. anyway now that i did that the foam expanded alittle more then i wanted and it doesnt fit in my tank anymore
. i guess im going to have to carve it up alittle. anyone know if carving the greatstuff that will be submerged will have an effect on its strength? i know that when you carve the skin off it is no longer closed cells. i am going to seal it with silicone reguardless but i wanna know if it may just fall apart after being underwater for a while.