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View Full Version : What is this stuff? It looks like hairy polyps.


xjgr
10/03/2017, 07:56 PM
Finding it in a few places around the tank. https://uploads.tapatalk-cdn.com/20171004/649d4587bb15b361ecc1759989adbcff.jpg

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DDon
10/03/2017, 08:03 PM
Looks like colonial hydroids.

Misled
10/03/2017, 08:10 PM
Looks like colonial hydroids.

Yep!!!

xjgr
10/03/2017, 09:02 PM
Looks like colonial hydroids. Effing bummer. Thanks for the ID

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UTCReefer
10/03/2017, 10:28 PM
They arent a big deal. I have them, and they come and go and shouldn't bother anything. Just treat them as something fun to look at that you didnt pay for.

jlmawp
10/03/2017, 10:31 PM
They arent a big deal. I have them, and they come and go and shouldn't bother anything. Just treat them as something fun to look at that you didnt pay for.

Same. They have stuck in the same places on my rock, but haven't really spread much. I have a crushed one or two that have gotten near my zoas, but othewise I kind of like them.

mcgyvr
10/04/2017, 04:49 AM
yes just leave them and don't worry.. they don't cause any trouble 99% of the time..

xjgr
10/04/2017, 07:57 AM
Luckily we were able to remove the two rocks that we can see them on. I have a feeling more might be behind our rock work. Thanks for advice, hope they don't become a problem.

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rhdoug
10/04/2017, 03:41 PM
Actually the look like a form of stationary jellyfish to me, I have been battling and stung by them for years. I hope I am wrong for your sake, mine were slowly taking over until I began periodic applications of kalk paste, which is fairly effective in killing them. The following is from a post from Dr. Ron Shimek from several years ago (an invertebrate scientist and author if you are unfamiliar with him).

"I believe your critters are the polyp form of a coronate scyphozoan
jellyfish. They are possibly in the genus Stephanoscyphus or Nausithoe
(there is some confusion in the literature about the proper name).
These animals will bud off small "thimble" jellyfish.
The polyps are reported to able to inflict a very nasty sting
with their nematocysts, so be careful in handling them.

The polyps are immortal, they will last as long as there is food
providing they don't get a disease, get eaten or have some other
malady occur. I don't think anybody really knows how many medusae
these can bud off per given time period.
My guess, if they are well fed, maybe dozens per year.
The medusae are small, about the size of thimbles
(hence the common name thimble jellies), but they are occasionally
REALLY abundant.
I have never been diving in the tropics when I didn't encounter
at least a few, so I think they may be able to bud all year long."
(shimek-RC 2005)

gogo7
10/04/2017, 04:11 PM
sorry rhdoug, i have to disagree with you... those are colonial hydroids, not thimble jellies. i have three colonies in my 4 gallon vase, they're harmless, and do not produce jellies. i've had these colonies for years now and have never seen a jelly in my tanks.
the colonies do grow large, but they're part of the reef biodiversity. i feed planktons daily and their colony size has stabilized.
i embrace hydroids. they're part of the ecosystem in a stable environment.

rhdoug
10/04/2017, 04:20 PM
I hope you are correct, gogo7, the other guys are nasty.

gogo7
10/04/2017, 07:54 PM
I hope you are correct, gogo7, the other guys are nasty.

sorry, no disrespect rhdoug, just experience with these particular hydroids.

rhdoug
10/04/2017, 08:29 PM
sorry, no disrespect rhdoug, just experience with these particular hydroids.

not at all, you are probably correct, and I hope you are!
cheers!:beer: