They can be sometimes. They are known to irritate certain corals. If that's pretty much the extent of the colony you could just smother them with some epoxy.
Those look a little big and fleshy for colonial hydroids to me. Could they just be yellow polyps? If so, they can be a little invasive, but don't pose the same kinds of issues as hydroids.
Those look a little big and fleshy for colonial hydroids to me. Could they just be yellow polyps? If so, they can be a little invasive, but don't pose the same kinds of issues as hydroids.
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