People have already suggested all the good plants, but I just wanted to add that my betta loves cabomba, and my kuhli loaches also love it. I think it's because it's quite dense they can curl up in it. Plants like amazon sword he's not as bothered about, in fact he ignores most of them. But all fish are different and it's a good idea to try a few different types to see what survives and what your betta likes.
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