Are you looking for a specific gourami for your tank? If so, tell us the size of your tank and its inhabitants and someone should be able to suggest suitable species.
I'm quite happy to list some of the more common types but there are so many species of gourami I could never list them all.
Sparkling gourami - trichopsis pumilus - around 1.5" - does well in groups of 4 in as little as a 10 gallon but preffers a larger tank that is heavily planted, peaceful
Croaking gourami - trichopsis vittata - around 2.5" - like the sparkling gourami but does better in a larger tank of at least 15 gallons and males will occasionaly challenge each other so try to keep more females than males in a planted tank
Honey gourami - colisa chuna/sota - up to 2" - don't confuse with the dwarf gourami, these are peaceful fish that can live in a tank as small as 5 gallons but do best as trio in a 10 gallon or more (trio is one male, 2 females)
Dwarf gourami - colisa lalia - around 2" - another peaceful gourami but males can be aggressive towards each other, a single male OR a couple of females will work in a 10 gallon, a trio is great for a 20 and more can be kept in larger tanks provided males are kept one for every 10 gallons with 2 females for each male. Comes in many different color morphs such as neon blue and flame red. Don't confuse with other colisa species as names are often used inter-changeably. When in doubt, ask for the scientific name.
Thick-lipped gourami - colisa labiosa - around 3" - very similar to the dwarf in temperament but hardier, its larger size means you should try to keep only a single male in a 15 gallon or a trio in a 20 or more.
Banded gourami - colisa fasciata - also called the indian gourami, giant gourami (don't confuse with the true giant osphronemus gouramies!) and striped gourami - to about 4" - another peaceful species similar to the dwarf in temperament. Keep as with the thick-lipped.
Pearl gourami - trichogaster leeri - up to 5" - the most peaceful of the trichogaster species and the most beautiful (IMO) of all gouramies, pearls are also known as lace and leeri gouramies. They are very peaceful but should be kept in a 20 gallon minnimum because they need space to swim. One of the few gouramies where males wont fight provided they have plenty of room. I reccomend a trio for a 20 gallon. A planted tank is a bonus and they love to have floating cover.
Three-spot gourami - trichogaster trichopterus - up to 6" - this is the most aggressive of the gouramies I am listing here and I would only reccomend a single male per tank with no other gouramies. Females are more peaceful and do ok in groups of 3 or so. In larger tanks, a male with a few females works too. There are some color variations often considered as different species wrongly - the gold, cosby, opaline and blue are examples. These fish do well in a 30 gallon and up with larger but quite peaceful cichlids such as angelfish.
Moonlight gourami - trichogaster microlepis - 6", sometimes a little more. These fish are almost as peaceful as pearls but require a large tank due to their size. A tank of 30 gallons or more is ok for a trio but 40 or more is better.
Kissing gourami - helostoma temmincki - 8" - visualy sexing these is impossible to do accurately and they require at least a 55 gallon tank to be comfortable. They WILL eat very small fish. These gouramies are the only ones in the list without ventral feelers so are not as much at risk from being nipped. They do well with larger or semi-aggressive fish such as sharks, large loaches and barbs. There are 2 colors - the wild green color and the pink color morph. The green is now very rare. There is also a 'balloon' variety which grows to slightly less, at around 6" and which does well in a 30 gallon tank. They are territorial and will shred most plants so give them plenty of room and don't plant your tank too heavily... The 'kissing' action often seen between fish is a territorial, aggressive gesture.
Well that's it realy - those are the realy common species. Just remember that though some of these species can be mixed, some can't. Ask if you aren't sure and NEVER trust an LFS to give you the answer you are looking for!
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