Originally Posted by Xeek
Have any acrylic shops around town? If you can get some exact measurements they can make panels you can fit in very easily and if you so choose, use nontoxic water proof silicone to mount them permanently.
I did this to divide my 15 gallon in half except I used glass and aquarium silicone. It was messy but you can go back when it's dry and scrape away excess with a razor blade. Worked great! Each side has its own filter but I only have one heater which keeps both sides warm, one side is just a few degrees lower than the other.
To make sure they can't see each other I thickly applied the aquarium silicone to one side of the glass and "textureized" it so that it looks frosted.
I also asked the glass guy to bevel all sides of the glass square so it wasn't at all sharp. Cost $8.