I've never heard of hem being paired with bettas, and personally wouldn't try it. Cichlids (though these are supposedly peaceful) are a big no. Even if it is nice, brightly colored and flowy is never a good idea.
edit: looked a bit more into it. seems possible, but only provided plenty of room and cover..probably have to cut short the amount of bettas. Chiclids are territorial, and need room to be left for them, so keep that in mind. Though it's possible, there are risks and difficulties, so I personally wouldn't do it, lacking much experience or alternate tanks. Up to you though.
Last edited by scrap; 01-05-2012 at 04:02 PM.