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I have five bettas (one passed away last night), and I divided up a 10-gallon tank for them to stay in. I've never heard of exercising them, mine do fine in their little areas. The tank only fits 4 bettas, so I keep my other one, Ocean, in a bowl. I change the bowl once a week.
Flopsy, do you remove all of the water when you change the bowls? I used to remove all the water, and my fish would die everytime. My husband said perhaps it was because the fish needed to keep the same ph, so now, I just strain the water and put it back in. My fishy has survived over a year this time. I'm just wondering if there is something else I can do aside from keeping most of the water.