I've had two cases of lethargy in two of my bettas recently. I need help deciding whether they need something special done, if they're unwell or just... depressed?
Jack- He's in a divided, heated, filtered tank with Finn. I've had him for about half a year now. In the past two days he's been just lurking among his plants and won't always come up for his food, which seems strange because he's usually about ready to eat my fingers whenever I open the top of the tank. Finn hasn't been showing any signs of similar lethargy or illness and Jack appears perfectly whole and healthy.
Mochi - I've only had him for a little while, but he's a more extreme case of lethargy... to the point that he will lie on his side and appear dead. I got him from a friend of mine who had become bored with him. He hasn't had a heated tank that's been cleaned regularly... is it likely that he'll liven up once I put a heater and clean water in his tank? I haven't had a chance to set up his tank, so he's been floating in a cup in my five gallon overnight with Hal. I'm actually surprised at how little either one of them have been reacting to one another given that the cup is clear. The five gallon is heated so he's probably warm, but still very slow to move around much.