Daniel with your size tank I wouldnt put any other gouramii's in it. It might work but chances are that the weaker one would get bullied till it dies. If your looking for another centerpiece fish for the tank to go with him try a german blue ram. They are very colorfull and only get about 2-3" They due require pristine water conditions as they are not the hardiest of fish. Being a cichlid they tend to have a bit of personality as well which is cool. Im glad you finally get everything back to normal again and have decided to stick with the hobby after your disaster. Best of luck to you.