There are mainly 2 types of gourami sold, Threespotted gourami which include the blue, opaline, gold, and others variants that dont all have threespots. The dwarf gourami is also sold in many varieties such as the neon blue, turquoise, cobalt, fire red and so on although they can be more beautiful hey aren't as hardy as hey used to be because of inbreeding so it is best to buy from a tank were there are no sick or deformed ones and buy ones your LFS has had for a week to 2 weeks so that all the weakones will be gone. Unfortunetely they dont usually have females because they are less brightly colored (and also have rounded dorsal ins) so it is best to get one male. Dwarfs can be peaceful or aggressive but are more usually the first. Threespot males are very aggressive especailly if they do not have a mate. They also will not necessarily take a mate. You should try to buy a male and two females when they are very young and if the male pairs with one of the females remove the other female. They tend to grow to at most 6 inches while dwarfs can grow to 2 inches. There are many other gourami's, kissing, pearl, chocolate, banded, sparkling and more that you can read about in the fish index under labrynth fish.
