Could I put a betta in with my red wag platys? Also, I'm thinking of putting in some zebra danio, dalmation mollies, turquois guppies, and some ghost shrimp (I think).
I personally have never had a problem with bettas and guppies-and most of my boys were in with guppies at some time or other (while i was keeping guppies anyway). You could try the guppies and see, but have a back up in case it doesnt work out as planned.
Danios need a bigger swimming space. they are very active.
cheers