Any idea what is on the back of rock?

Hsquared

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Anyone know what these little whitish things are on the back of my rock? They remind me of dandelions with the white fuzzy top but much much smaller.

7BC27254-DC89-4172-89A4-6D3E47442630.jpeg
 

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I got same creatures in my aquarium. Are they harmless? I think they kill my gsp but im not sure..
How can we get rid off them?
 

Billdogg

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I agree that they are hydroids. IME, they will go away on their own. I'm guessing it's a fairly new tank?
 

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