I have a betta in my community tank. I have had a 10 gallon tank for some 25 years. It has been mostly stable (occasional fish dies—then I suspect I have too many and accept the new balance) over the years. Currently I have 2 neons, a small pleco, 2panda cories, 3 kuhli loaches, 1female BETTA.
I added the following due to algae problem and recurring nuisance snail problem: 1 nerite snail, 1 assassin snail, 1red shrimp. I also added wood—was told plecos like to eat it but never see pleco on it, ½ almond leaf—I read it has many benefits; betta likes going under it.