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FAQs about Pseudocorynactis Corallimorphs

Related Articles: Corallimorpharians, Cnidarians, Water Flow, How Much is Enough,

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Pseudocorynactis questions    1/3/19
Hello Crew! Hope all is well with you and have a happy New Year!
<And you Joanne>
Got a few questions for you today, as always I appreciate your advice and input.
I recently had two tiny polyps pop up on some live rock rubble I got from the bin at my LFS. It is ultimately destined for the sump but I always like to give new rock a chance in the light to see if anything interesting pops up. Anyway, there were these two tiny white specs, honestly at first I thought they were a couple of tiny pineapple sponges. But over a few weeks they slowly got bigger, enough that I could make a tentative id.
I'm assuming these little guys are NPS, since they were probably in that non-lighted bin for some time. As I said, at first they were dead white in color, but now that the larger of the two has grown a little I can start to see some orangey color at the center. The balls at the end of the tentacles are still white. I have noticed that they are only active during the daytime, and after lights-out they close up.
<Sounds like this Shroom>
This behavior, along with the fact that the live rock at the LFS is all Indo-Pacific origin, leads me to believe that that is the most likely source for these little guys. Do you agree? There is of course a very
very remote chance that they hitchhiked in on a gorgonian from the Caribbean but not very likely IMO.
<Could be>
Second question, do / can these critters change color over time? I know the Indo-Pac Pseudocorynactis can be very colorful but so far I have only seen that little hint of orange. Maybe that is just because they are so tiny? Do you think they may become more colorful as they grow larger?
<Can/may change to be more or less colorful... depending on conditions, nutrition>
I've heard they can be dangerous to fish, and have also heard that they are likely NOT dangerous to fish, LOL. What are your views on that?
Right now they are too tiny to hurt anything so I'll just keep an eye on them as they grow. If they grow very large or seem to be becoming dangerous to my fish, I'll set them up in their own little nano aquarium.
As always, thanks so much for your helpful words!
*Joanne White*
<Cheers, Bob Fenner, diving down in Roatan, looking for this genus, but thus far just Ricordea florida>

Type of Corallimorph    3/7/16
Hi crew, No question here! I just wanted to submit a pic of one of my white ball Corallimorphs.
<6.2 megs... in Roatan>
I think they look awesome and are great additions to reef aquarium. I've had 3 in my tank for almost 5 yrs now. I spot feed every once and a while. The biggest one can open to over 2" full tentacle extension (at night). I know that there are smaller types that can spread like Aiptasia and might become a nuisance but this particular type I've had for years now with no issue.
Happy Reefing, Cheers!
<And you, B>

Weird Pseudocorynactis sp. behavior 9/5/09
Hi folks,
I've recently had these Pseudocorynactis pop up all over the rocks in my reef tank. But today, I noticed a new and odd behavior.
<I'll say!>
There is a long two toned "stalk" from the center of the anemone.
As you can see from the attached picture, the white tip seems to have several "hairs" all along it to the end.
<I see it/this...>
Have you ever seen anything like this? Any ideas what it may be doing?
<I have not and don't... the tube portion looks like a leathery tubiculous worm... the "worm" itself? Bizarre. Am going to post on WWM in the hope someone will recognize what this is and chime in. Thank you for sending this along. Bob Fenner>

Re: Weird Pseudocorynactis sp. behavior-- 9/5/09
Just a note........not sure if it has anything to do with this, but I have a very large, healthy feather duster in the tank which was "smoking" but don't recall if it was before or after this event. If memory serves, it was after.
Also, the "worm" comes from the location of the mouth of the Corallimorph. In fact, it appears to *be* the mouth.
<Thank you for this further input... Is (to me!) for sure a mystery! Let's wait, hope not so to someone else. Cheers (and biers), BobF>

Re: oh, and the mystery marine object-- 9/5/09
Hi Bob,
Under the topic "Weird Pseudocorynactis sp. behavior 9/5/09" I do believe that thing is merely a crustacean limb attached to a sticky Cnidarian.
Whether a moult or otherwise cannot say. The segmentation and the setae along the edge seem pretty consistent with an arthropod limb.
Cheers, Neale
<Ahh! A very good "guess" I believe... Was wondering what the object reminded me of. Will forward to the querior, accumulate. BobF>

Ball Corallimorph - Pseudocorynactis 11/17/03 I have two questions for the knowledgeable crew of WWM - if you can spare the time :) <ready and willing!> 1. A while back I found this cutesy little hitchhiker on my live rock (photo included). Can you tell what it is? The only possibility I came up with is a Corallimorpharian, Pseudocorynactis sp. (although in the pictures the colors are different). <you are exactly correct as best I can tell my friend> This worries me a little, because Julian Sprung says in his book that the Indo-Pacific Pseudocorynactis will grow big and eat small fishes/mobile inverts (!) <understood... but very unlikely/uncommon in my opinion. Where did you get your live rock from? This genus is found and smaller in the Atlantic too/Caribbean> I like the little fellow, but if he's shaping to be a fish eater, then I'd better nip him in the bud, so to speak.  So it would be helpful if you could confirm - or refute - my identification. <unless fed well/heavily... I don't see this creature growing too large for you. Enjoy it> 2. I know you guys are against mixing different groups of corals (SPS, LPS, Zoanthids etc) <very much so> - and it makes perfect sense when we're talking, say, about tabletop Acropora from the reef front being housed together with mushroom corals that naturally live in calmer, deeper waters. <exactly> But how about species from the same habitat? Say, Montipora digitata and soft corals - all lagoon dwellers? Wouldn't it be natural to put them together? <indeed... and yes, I am more comfortable with that (although we still have to reckon with more allelopathy because we do not have the dilution of the expanse of the sea at our disposal). I am asking because I have softies at the moment (the beginner's obvious choice), but I would love to try Montipora one day - and then, barring a total re-haul of the tank, it would find itself among soft corals... What is your opinion of that combination? <I sincerely think the Montiporas are a fine choice here for many reasons.> All the best Anka from Poland (a dedicated fan of your great site :)) <with kind regards, Anthony>

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