My poor, sweet male Betta. How unfortunate of him to come home with me. I am (obviously) new to this and was extremely uneducated when I bought my beautiful male Betta about 2.5 months ago. I have a 2.5 gallon tank for him with lots of decor and colored LED lighting with (shaking my head) a bubbler thingy and waterfall filter and NO heater. UGH.... I did turn the bubble agitator off some time ago, but after reading this now I know I need to turn my filter down and get a heater. This explains why he spends a lot of time at the bottom of the bowl. I feel like such an idiot. Poor little guy. The minute I get home I am installing a heater and thermometer. And here I was thinking I was the master Betta keeper because I cycled his tank properly and kept his PWC up.
I have a lot of work to do this weekend for my new pets ( I have a 30 gallon tank too.)