I raise the corys and have had an opportunity to watch quite a few of them now at various ages. 
It seems to me that while all corys like to spend some time playing, the young ones never want to stop. I have two tanks of young bronze corys and they are in almost constant motion. They can be resting quietly on the bottom, but as soon as I put the light on and drop some food in they start. First they eat, then zoom up and down the glass or from side to side.
A really funny thing to watch is when one of them gets the idea to dart up to the surface and grab a gulp of air. All of a sudden they all have to do it to! It's like watching someone yawn and then seeing everyone else do it too.
Corys can be really funny!
It seems to me that while all corys like to spend some time playing, the young ones never want to stop. I have two tanks of young bronze corys and they are in almost constant motion. They can be resting quietly on the bottom, but as soon as I put the light on and drop some food in they start. First they eat, then zoom up and down the glass or from side to side.
A really funny thing to watch is when one of them gets the idea to dart up to the surface and grab a gulp of air. All of a sudden they all have to do it to! It's like watching someone yawn and then seeing everyone else do it too.
Corys can be really funny!
