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My betta has recently been lethargic and laying around in the bottom of his tank or on top of his heater which is where he likes to sleep at night. He doesn’t have any noticeable diseases on him and he still comes to the top of the tank and eats his food with quite a lot of energy. Not sure if there is anything wrong with him or if I need to do any water checks or anything. This started happening about 5 days ago but it’s been on and off.