If you could only keep ONE fish(or a group if they are social fish), and it can be ANY fish in the world, but you can't have ANY other fish, what would you choose? Also the tank, aquascaping materials, plants, food, and anything else to go with this fish are FREE. So are invertebrates if you want them. Also, your other fish you have right now won't die, and will go to a nice home that will take good care of them. Ans if you don't have the space for them, you get another room built for free for the tank. For me it would probably be some sort of gourami or cichlid as they just have really good personalities.