I think the algae is food and not zoochlorellae. I can't decide what form the macronucleus is. Apart from the algae it seems to be colourless.
I'm hoping for Stentor muelleri

Video 1 - https://www.flickr.com/photos/154534235 ... ateposted/
Video 2 - https://www.flickr.com/photos/154534235 ... ateposted/
Video 3 - https://www.flickr.com/photos/154534235 ... ateposted/