What do you mean pearl? Not into gouramis too much.Love bettas!
Have you considered 3 honey sunset gouramis? Or 1 Pearl with the female bettas?
Should I not do barbs? Could I maybe do like a scarlet basis or something like that? Also while watching these rainbows I noticed their fins on the side behind the head. I forgot the name of them. Are pointed upwards and it’s really cool can’t tell if they’re pointed up or just really big.Pearl as in pearl gouramis.
Rainbow and betta should be good but I’d be worried about barbs and bettas.