Thx, I googled and agree. Should I just pick it off the rock?
Honestly don't recall [emoji20] there are two of them. How can you tell if they are invasive? I still don't want them hurting any fish.That doesn't look like an invasive type to me, but I could be wrong.
Where did the rock come from in the world?
If you can remove the rock with ease just burn it off with a cigarette lighter. This can be done in a matter of minutes.