I have 2 male honey gouramis in a 20 gallon tank and they do occationally fight but they fight only for 2-5 minutes and dont really hurt each other. But as yours is a smaller tank I would say go with 1 male and 1 female and do have a spare tank ready. Just 1 Male or female would be best with some other small fish but you could do 1 male and 1 female if you have a good filter and do weekly water changes