+1. Adding another half dozen cardinals and a couple more sunset gouramis would give you a more balanced tank and reduce potential aggression.
I've seen both honey gourami (species is Trichogster chuna) and the red form of the dwarf gourami (Trichogaster lalia) sold as sunset gouramis. If you have the former adding a 2 or 3 more will be ideal and you don't have to trade the two you have in. If you have the latter I agree with Jake72 100%, trade them in for honey gouramis. If you can post a pic we can help you ID them.
WYite