Gourami Nipping Sunfish, Aggression Flares

I had a gourami prior to my sunfish, so I really had no choice but to have it as a tankmate with the sunfish. When I first got the gourami, all it did was hide behind things and be afraid of everything. It hid behind things like a coward and did nothing. When I put the sunfish in the tank, the gourami came to life with aggression. The gourami started going after the sunfish like crazy. Fin nipping and pushing them around. 

The sunfish are new so they had no choice but to take the aggression. I actually lost one sunfish because of the anxiety levels in the tank. I figured on one of the sunfish not living through the change and setup but that's just life as an aquarist. I have 5 sunfish but now I have 4 with the one that passed. 

Gourami Got Shutdown

The sunfish schooled up and the aggression from the gourami stopped. The entire school of them shut down the gourami and now the sunfish are in charge of the tank. I think it's sort of funny but I figured it would happen. Enough said. Just another aquarium update.