Zoas not opening and now extending polyps

[dach]

Hi,

i have had zoas in my tank from the beginning of my tank in June 2021. My first coral was a zoa. They have grown and spread out a lot on this rock that i have them on. Each colony grew from 1-2 polys each. Now some of them aren’t opening and have just yesterday started to extend their polyps…

Also one of my zoas closed up and is turning red, any idea what this is?

i did notice what might be Dino in my tank (see attached image of my toadstool), could this be problem?

 

[DeniseAndy]

Can you get a FTS? The toadstool could be just shedding or irritated. The zoas could be getting bothered by dinos or cyano or something else. What all is in the tank? Animal wise?

 

[Rickybobby]

I did some research on this a year ago found out that iodine can play a decent role in there function. Now in Canada I can’t find an iodine test kit so I’m very careful but I dose one capful of seachem iodide after a water change and I have never had a zoa issue since. Knock on wood

 

[dach]

Sure thing, stocking is single clown, yasha goby + candy pistol, hectors goby, some hermits, a Mexican turbo snail, some 2 zebra turbos, 2 bumblebee snails, 2 tiny cerith snails, cleaner shrimp, and peppermint shrimp.

i think there’s a chance my peppermint is bothering some of the corals. Toadstool is putting out Polyps just fine it’s just got this brown hair algae looking stuff attached to it which appears and disappears, which to me seems like Dino.

I can try to up my water changes to get back some iodine in my water. I don’t currently dose anything. I think my phosphate is a little high right now so I’m planning to throw a new bag of chemipure in

 

[DeniseAndy]

Nice tank. I do not see anything that I would say is visual that could be bothering zoas. The peppermints will bother corals sometimes. Clams too.
Could be iodine as the leathers also like that supplement and could take it up faster than the zoas.
No huge issue with dinos can be seen or cyano, but could still be there.
How long since they have opened. I would not worry unless you see them disappear or maybe after 4 days or so. Zoas can be weird. I have had colonies that were thriving then just die off. Not sure why. Hope yours are just angry.

 

[dach]

Thanks. It’s been a few days since they’ve fully opened. The one that’s red hasn’t opened in a week or more.

 

[Rubber Ducky]

I had this same thing recently happen to me also, and tried all sorts of things, no luck. My friend suggested phosguard, excuse I might have too much silicates. I used some phosguard for 3 days in my sump. Did 50% waterchange...and everything bounced right back! Try that, it worked great for me.