Instead of a aquarium divider I went to a michaels and got a 3/16 inch thick piece of would that measured 12" wide by 24" and then cut the length down to around 19 5/8" and then slid the bottom in place then gently slid the top under the middle brace. It cost me $2.50 alot cheaper than $13.50 for the divider. This works better because they cant see each other and is thicker so they cant knock it down. I will post pics later today when I get home.