Looks like hydroids to me too. They can spread quite badly and burrow into the rock quite deep so removal can be a challenge if they do spread. Unfortunately manual removal is probably your best bet. There was some talk about Panacur as a possible treatment but it is not a good thing, it will kill all worms, shrimp, etc. .. Only a last ditch effort.
Since adding a copperbanded butterfly I think I have fewer of them. Can't say I've seen him go at it though, so could be coincidence.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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