I think I solved the problem with the tank divider
Before Hannibal was able to slip through a small gap between the tank wall and the divider. I had placed the clips that would hold it in where the instructions said for me to,but I've now rearranged them so the sides of the divider met the tank wall. I'm testing it with Hannibal now to see if hell slip through tonight. If he stays where he's supposed to he. I may move 007 to his half tomorrow.
Hannibal: Male Baby Betta of Unknown Fin Type
Tonraq: Male Half-moon Dragon