Colonial Hydroids

How bad are they? Are they on a rock you can remove?

If so, easiest way it to take the rock out and let it dry up for a couple months. You can also try smothering them in superglue.
 
If you can, the best solution is to totally remove the rock. If not I would cover them with aiptaisia X then cover with kalk paste. They are one of the worst pests to get :(
 
Get it out! Get it out! Get it out! Pull the rock out, boil the $#!% out of it, and let it sit for a couple months.
 
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