Hello, so I've had my Green Terror for almost a year now and he's up to about 4.5 inches. Been very healthy since I've had him. Only recently has he been acting very slow and almost like he's weak and is always just laying low under things in my tank. His usual behavior is pretty energetic and eats a ton. Now he is eating hardly anything. He also has a small peeling on his head, can anybody help me with this issue?