Quote Originally Posted by LittleRainbow
Not true! I had 2 rainbows and a red tail together and they all got along fine!!!!! (my dino bichir ate it after he lost his eye) It all depends on the fish :) I would get one until they have expressed their personality then look at getting another if you really like them!
True!!!

So, how was an eye lost? Eyes are often one of the things aggressive fish go after.

Do some reading.
Social Behavior
The rainbow shark is not a social fish; do NOT keep more than one in a tank. They are very aggressive toward one another and to similar "shark" species, such as the red-tailed shark.

Keeping babies together is not like keeping adults together. How many years did you have yours?