Do Cory's Synchronize Dance?

[hillmar77]

Recently I've been noticing that all my cory would space themselves up and go up and then to the left; and then up and then to the right; and repeat over and over again for 20+ minutes at a time. looks like they all are doing it in sync too.

 

[Carlovel1]

My corys do the same thing LOL, they never stop. Dont know why they do it though.

 

[Inchworm]

Like this?