Can you take a close up picture? Does that stuff look like this? These are pics from one of my tanks a long time ago. I had these little white things that had a stem and little tentacles that formed a cup shape. They would shrink when I touched them. I had 1000's. I remember no one could identify them. Finally I took them to my buddy who works in a lab breeding salt water fish, he said it was not hydra, its a fungus. I tried everything to get rid of them, they are immune to everything but a bleach dip! haha I literally gave up trying to kill them, one day I woke up and they started to disappear, they pretty much went away on their own.
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