I'm thinking about adding a male betta to my community tank of 4 danios, 5 rasboras and 2 Yoyo loaches. The aquarium is 20G. Do you foresee any problems? I'd like to breed him in this environment too. What do you think?
I didn't have a good experience with danios and my betta. They were fin nipping punks while they were with my betta.
I don't know about the yoyos either, they can be agressive/pushy sometimes.
I wouldn't advise putting Bettas in with Danios either, or any other fin-nipping fish. As for breeding him in this environment, I dunno if that will work. I would imagine that he'd get really agressive and territorial one he had his nest going. Besides, other fish might start raiding the nest and snacking on the eggs and fry. There's no reason you cant condition him for breeding in the community tank, though.
Depends on the temperment of your danios I think, I have 4 bettas with 4 danios and they are all fine. As for breeding him in a community tank, I wouldn't advice it, better to get a seperate breeding tank for that I think.