Hello and welcome to fishlore
There are different types of Gourami's that are available. The largest are the blue or the gold Gourami. I never found them aggressive in my tank. The Dwarf Gourami is more colorful and usually you only find the males available at the LFS. They for some reason seem to be more aggressive towards each other, I also had them before and they chased each other around all the time.I also would advise against getting any Angelfish if you choose to keep Gourami's.
I have also had the 'honey' Gourami which is the smallest species of Gourami and much more peaceful in a community tank and I never had any problems with them.
