I'm a gourami expert take it from me. They can be peaceful if kept with the right type of fish and tank. now tell me what tank,ph, plants you plan on putting in, and fish you will also be putting in. Gouramis sometimes eat algae and are not picky eaters. They like floating Plants. Now the most peaceful Gourami is the powder blue dwarf gourami. It will actually stop almost all fights in the aquarium. but never put two males. always put a ratio of 2/1 1 for males 2 for females. Or you could just get 1 male or female. Anymore questions?