View Full Version : What on earth are these!?

08/08/2017, 07:34 PM
So a few days ago I started seeing a few of these little fuzzy things attached to one of my acros. There are now more, but still not a large number. I don't see any signs of problems yet but I am concerned.

You can see them near the tip on the right side. They kind of look like hydroids.


08/08/2017, 07:38 PM
They are hydroids. I found an answer by googling "hydroids on coral".


08/08/2017, 08:38 PM
Zanclea Hydroids
From what I've read and experienced personally they are unattractive but harmless and tend to wane over time.

08/08/2017, 09:24 PM
I'm glad to find out they are harmless.

08/08/2017, 11:34 PM
I wouldn't qualify them as harmless, but they can be if you only have a few. I had some develop on an A. exquisita frag and almost completely wiped out the frag. It started to STN (it was completely covered with zanclea hydroids), so I broke off the frag from the rock it was on. Fortunately, a little nub remained on the rock with two or three polyps left. I didn't think it would survive, but it did and without any signs of the hydroids remaining on the new growth. I've since fragged this coral a couple times and it's one of the coolest looking pieces I have. Hopefully you won't have any issues? I wish you the best of luck.
Also, these usually come from wild pieces.

08/08/2017, 11:55 PM
Does anyone know if a Bayer dip kill hydroids?

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08/09/2017, 01:03 AM
They live within the tissue, so dipping won't help much, at least in my case.

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08/09/2017, 01:10 AM
Not the best pic off them, but they started to pop out everywhere on the frag shortly after this pic was taken.

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08/09/2017, 01:18 AM
After breaking the frag off the rock in June of 2015, I was left with a little nub. The two or three polyps that were left behind grew slowly and this pic shows the growth after 4 months.

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