75 gallon/kissing gourami tankmates

I recently restocked my 55 gallon tank, and am noticing some aggressive tactics from one of my kissing gourami as well. Right now I have 12 zebra danios, 2 kissing gourami, 2 dwarf gourami, 2 gold gorami, 2 lavendar gourami, 3 dwarf rainbow fish, 1 rainbow shark and 3 plecostomas. So far they seem to be doing pretty well together, but there is 1 kissing gourami who likes to chase the other fish. I can't tell if he's just playing or being a bit aggressive.
Yes, your tank has too many gouramis for it not to be aggression really...
 
I will look into the larger barbs, I have never kept any other than tigers. I love the idea of a birchir, I don't think the kisser would target it. I guess it will really be touch and go. Thanks for the suggestions.
 
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