Zoanthids dying???

jpc763

Active Member
This Zoanthid frag was great for about 2 weeks. Just today the right 5 or so polyps closed up like this. Did they die?
 

veni vidi vici

Active Member
Mine close and open all the time,useually when light cycle changes or when hermits ,snails,or fish touch them.Like the critters above and below your zoanthids.
 

jpc763

Active Member
Thanks for the reply. So I pieced together what happened around the time they decided to close.
I got an emerald crab, 2 more coral frags (candycane, shrooms) yesterday and a 5g tank to build up as a QT. I temp acclimated the coral and drip acclimated the crab. I put all 3 into the DT and all was well with the Zoo colony (both new corals are on the other side of the tank). Most if not all of the polyps were open.
I siphoned off about 3.5g of water out of the DT and pulled out live rock rubble to begin cycling the DT. I also scooped about 1/2 cup of live sand out of the DT. I added 3.5g new saltwater into the DT to replace what I removed.
When I reached my hand in to the tank to get the sand, when I pulled it out, I noticed that 5 or 6 polyps were closed. They were closed tightly as can be seen in the picture. My hand was near them and I could have touched them.
Does any of that help?
 

earlybird

Active Member
Yep your hand could have touched them or just created a different current than they were used to. No worries.
 

tangwhispr

Member
it looks like there could be a nudi on them, look between the 2 closed polyps in the middle. You could always try to dip them to be sure.
 

jpc763

Active Member
Below is a zoom of just the Zoo's. Tonight the same 5 or 6 are either closed or mostly closed. One or two others are closing.
Is the thing in the middle of the closed area a nudibranch? And what do you mean by dipping them???


EDIT: Only 2 are closed. 1 is barely open and 3 more are mostly open. The rest of the colony is totally open.
 

tangwhispr

Member
I prefer to use seltzer water, i put the zoas in a white container, pour about a quart of seltzer water, then add 10-12 drops of lugols and let them soak for about 5 min. I also add a couple drops of FW Exit in case there are flatworms. You can also buy Coral dip and most LFS's but i prefer the lugols so i can use it for other things.
 

tangwhispr

Member
Lemme also add you should dip any and all coral that you buy, trade, etc. Although i do NOT use seltzer water for any other then zoas.
 

grabbitt

Active Member
They're probably fine.
Zoanthids are pretty tough coral from my experiences...
My maroon clown tries to spend his entire day flipping any loose frags off their rock and onto the ground, and when he does succeed (which is frustratingly more often than I would prefer), I put them in a tighter spot and they open back up soon after
 

jpc763

Active Member
Originally Posted by TangWhispr
I prefer to use seltzer water, i put the zoas in a white container, pour about a quart of seltzer water, then add 10-12 drops of lugols and let them soak for about 5 min. I also add a couple drops of FW Exit in case there are flatworms. You can also buy Coral dip and most LFS's but i prefer the lugols so i can use it for other things.
Thanks for the input TangWhispr!
I assume all of that is available at the LFS? I know what seltzer water is, but the rest of it is greek!
To make matters worse, the darn thing is glued down (underwater epoxy)!!! I glued it down because every morning it would be upside down in the sand. I assume the brittlestar would knock it off. I wonder if I can pry it off.
BTW, did you look at the pic? Does that spot in the middle look like a nudi?
Thanks again. J
 

jpc763

Active Member
Originally Posted by TangWhispr
Lemme also add you should dip any and all coral that you buy, trade, etc. Although i do NOT use seltzer water for any other then zoas.
OK, I had never heard that (or read that in my books). Good input. Cold water dip or a salt water dip?
 

lazypinoy

Member
i usually do a iodine dip everytime i see a declining colony. last dip i did on one i found 3 sun dials and a few pods, and a nudibranch. after that i always examine new zoos.
 

jpc763

Active Member
Originally Posted by GRabbitt
Um... What is that?
I believe that is a Nudibranch that preys on Zoanthids.
 

tangwhispr

Member
Yes, its a Zoa eating Nudi, Zoas are munched on by zoa spiders, nudis and sundial snails. The Nudi's will turn the color of the zoa that they are eating to better blend in. I suggest a Halichoeres Wrasse they are a natural predator of them.
 
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