
Bettas love big spaces to explore and there are some compatible species they won’t beef with (like corydoras), but you have to make sure the current isn’t too strong for them and there’s plenty of platforms, plants, and hiding spots for them. They don’t do great with open water so that’s the only thing
I think that’s a good idea! It’s been a while since I had a betta setup but I think I had snowball shrimp that lived for a while peacefully. I’m not actually sure what happened to them, my dad ended up taking over my tank after a few years because I was moving a ton and it was going to disturb them :,)