My steel blue betta fish "Blue" is acting kind of weird. He is normally in a 5.5 gallon tank, but I had to move him to a 2.5 gallon hospital tank when he got a mild case of ich. When I say mild, I mean 3 or 4 dots and a tiny splotch under his gills. He comes to the surface to eat whenever I come near him, and he is still pretty active, but a lot of the time he just sits in a large PetSmart spiky plant. I am using an overlarge heater to warm up the tank a little extra, but it has an auto-adjust feature. I do have a betta hammock, but he doesn't use it too often. Is this normal, or do I need to do something?