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I have a male betta fish that I got in late August, and for the past week, he has not been acting normal. He has been lethargic and laying around on the bottom of his tank and on his betta hammock, hardly moving for hours. I know bettas aren't the most active fish, but he has never acted like this before. I have a small heater that keeps the water at about 78 degrees most of the time. I used the betta water dechlorinator and specialty betta food. I have had fish for years, but this is my first betta and I really don't know that much about them. He doesn't show any external signs of sickness or injury. Do bettas get sad or lonely somehow? Any help or advice will be greatly appreciated!