What is this?

trinityh13

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What are these? They are all over my dad’s tank but I wasn’t fully sure what they are, are they good or are they bad?
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trinityh13

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What are these? They are all over my dad’s tank but I wasn’t fully sure what they are, are they good or are they bad?
IMG_5958.jpeg
I’m guessing hydroids? They have been in the tank for a little bit apparently but never have gotten bigger than in the picture. If unwanted how do you get rid of them?
 

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Generally a pest as they spread easily. And they stink to high heaven out of water. I generally hand-picked them with tweezers for small amounts but may want to pull the rock and dry out with the quantity you have.
 

ISpeakForTheSeas

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they're either colonial hydroids or Nausithoid jellyfish polyps (probably from the Nausithoe genus):
to my knowledge, they're not invasive (or at least not always), but they reportedly do have a nasty sting for some people
For removal ideas:
No personal experience with removal, but this is what I've heard on removing them (keep in mind there a lot of different species of hydroids, and some may respond to one treatment while another may not):
I've heard smothering the hydroids with kalk paste may work, but here are some other threads with suggestions that might be helpful:
Edit: A relevant link in post 7 of the link above:
 

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