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I thought the bacteria also needed a constant oxygen source too, though, which is why they grew in filter media. Well, maybe with frequent enough water changes, that gives them enough oxygen? Hmm. Thanks to you and the other poster for the replies and advice.

I rather doubt that, just because I've been carefully monitoring his behavior since I got him, and he never showed any of the behaviors associated with ammonia poisoning. I've had him over a month now with and he's had no signs of illness or fin rot or anything that I've read typically goes with...

So, I've been keeping my betta in an unfiltered but heated 2.5 gallon tank for about the last month. Yeah, I bought the fish first and the small tank intending to keep him in the unfiltered tank indefinitely, then started reading more about bettas online, felt guilty, went out and bought a 5...