What kind of problems? Moonlight gouramis are supposed to be much more shy/passive than blue gouramis, so if your blue got beat up, it's possible the moonlight will too. Many people have said the paradisefish doesn't get beaten on because he is too aggressive and has the barbs cowed. I don't believe this, though, because I've definitely seen the barbs swim right next to the paradisefish at breakfast and try to shoulder him out of the way to get the first bite of food.
