I split my 55 gallon into 1/3 water 2/3 dry for my African Bullfrog using plexi purchased from Lowe's that I cut to size myself with a box cutter and a straight edge. Aquarium silicone adhered well to the plexi, but I also sanded the edges to rough them up just to make sure. I also scored the plexie using a dremel in order to add some grip for my frog to get out. Seems to be holding up great so far.