I am making and selling tank dividers for 10 gallon tanks (MAX 12" X 12")
see the auction on aquabid
Or buy one for $20 through me directly (includes shipping to USA or Canada)
-I make tank dividers out of plexiglass that are very high quality and make a great divider. I currently am selling them for a 10 gallon tank, I can cut it to your tank's size. I will make it with or without holes (your choice, no charge). Just let me know your tank dimensions.