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I temporarily had two angels in my 29 gallon with my female betta sorority and two Gouramis and some kuhli loaches and everything went fine the females hid a little more but then again it was only a 29 gallon so in a bigger tank it would probably work out better
Size is an important piece of info for sure. Female bettas can work well in a community, but I wouldn't necessarily stock them with other anabantids and angels would be questionable for me as well.
I have 1 female betta currently in my setup...and she's doing great! She and my Bolivian Rams are getting along too! I'd say only one female betta in your 30 gallon unless you get two very young females together at the same time, with thick vegetation and decor should be fine. IMO.
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