Please ignore, I accidentally posted twice.

YouTube link: https://youtu.be/r8-jg8hvcQg

Note: I am not knowledgeable enough on ciliate behavior to be confident that these ciliates are in fact "having a good time". The ciliates in blue are likely following some sort of gradient, my guess is oxygen. Therefore there is likely a range of comfortably within the ciliates in blue.___