I have 6 cory cats in my community tank.
LOVE them, very fun to watch, and they are just crazy.
HOWEVER, many people think they are tank cleaners... really they just eat extra food from the other fish from teh gravel, and you still hafta feed them tablets.
If you want 1, get 2 minimum. My 2 ablino's stay together, and my other 4 stick together.