Thank you for all the advice. I was thinking they were getting a bit too big to share that tank. They have been together for at least 8 years and were never aggressive towards each other before. They are starting to fight a bit during feeding time and that has me worried. They have always stayed in the same hide together no matter which side of the cage it is. I will get to work on getting another tank and all the thermometers. They do have a heating pad under the cage near the half log.