Fuzzy algae or what!?

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Yaya

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hi i have a 100 litter saltwater tank, and i found somthing fuzzy like tiny dandelion on my live rocks even on the wall of the tank
What are these? Are dey harmfull?
 
Hydroids, they can filter the water and sometimes they come with colors, they are harmless so don't worry about it.
 
They are not harmless! Not the ones in my nano. They kill coral!

I am fighting them in one of my tanks and they destroy everything they come in contact with. One rock used to have candy cane trumpet corals on it till these thing popped up in it and killed it. I had to take the rock out and take a torch to it to kill them. I have them popping up in other places right now away from my corals. I’m gunna try boiled rodi water squirted on them since they are away from anything I could hurt


These little dandelion poofs/hydroids are bad news and looking like they will be a never ended battle.
 
Agree^
Not something you'd want to have, although the ones in the photo above do seem to be of a somewhat nicer kind. Took me ages to get rid of them. Haven't lost any coral but it was a very close call and a lot of work to get rid of them.

hidroidi.jpg
 

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