I have a betta who is old, but has always been perky and exciting. Within the last couple of months, he has had a lot less energy. He spends most of his time resting at the bottom of the bowl. In the last couple of weeks, however, he has had some odd behavior. He now floats facing straight up, as if he's looking at the ceiling. About every 30 minutes or so, he will shoot up to the top and circle around the top very quickly with his face outside the water. Then he'll float down and face the ceiling again. What is he doing? Has he lost it?