Definitely a ciliate. Slow, plodding, rolling motion. Eats Trachelomonas (round ones).
https://youtu.be/4l_7gzhoMPY
Unknown for ID
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- Robert Berdan
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Ciliate identification
I think it is Spirostomum - have a look at Wikipedia to see its features:
https://en.wikipedia.org/wiki/Spirostomum
https://en.wikipedia.org/wiki/Spirostomum
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The long critters are Spirostomum teres (compact macronucleus, centrally located). I can't help with the other guy.
It Came from the Pond (Blog): http://www.itcamefromthepond.com/