I was just feeding my azureus, and when I approached the tank, they were both on the glass. I got very excited when I noticed that one of them had bigger front toepads than the other. Then that one slid down the glass and kept the front feet on the glass and pressed its nose against it to look at me, and I noticed a roll of skin under the chin that the other one doesn't have. It seems after all that guessing and worrying, I HAVE A PAIR! WOOHOO!