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Thanks for this! They are so tiny it really is hard to say and even harder to get a clearer picture - even with a magnifying glass up close. They do seem to have some sort of a “head” on them, although they are far too small to determine the shape.
Here is a pic with very young / small Hydra. They look similar to what a Planaria might at first glance but they have little arms tentacles, and otherwise you can clearly see the head on the other pic from Aiken Drum.