Dividing this tank won't work. It's too tall and won't allow for a cool side and warm side. I did find a tutorial for setting up plastic totes though so I'm going to get the get together for that. I've already got the totes (which I realized are actually 34qt instead of 21qt.) I've got the perfect space for the totes that will properly hold heat and provide security for them. I have had BPs before but never knew they should be housed separately the other two i had always seemed fine and never pulled this stuff Malcom did today. Guess you learn something new every day.