Need help with Zoas dying.

[jonlong724]

I have some zoanthids that have been growing very well for a while now, and they started dying off in the middle of the colony. I am attaching a pic because I can see a white branching looking thing and I'm not sure if it's an organism that's doing damage.

Any help would be greatly appreciated!

 

[terrypercula]

I gotta think some kind of predator is at fault here. You ever search the tank at night with a flashlight?

 

[Inspiritte]

Witch type of salt do you use? I have the same problem with Green zoas on instant ocean salt, but when i changed it on tropic marine they all become alive)

 

[jonlong724]

I have seen the tank at night but haven't looked for a predator. I will do that. I switched from Red Sea to instant ocean, but about 2 months before I started seeing problems. After switching to instant ocean, I saw improved growth.

 

[jonlong724]

Any idea what the little white branched structure is where the zoas are gone?

 

[Inspiritte]

In center? Its a stone i think. In the left side i can see the bubble i think its valonea
Your zoas a looking healthy, some of them are closed but i think its temporary, try to change water parameters: reduce no3 and phospathes for example
If it possible try to make hd macro photos

 

[Inspiritte]

Like this mine

 

[jmil08]

Have you introduce any new corals in your tank?

 

[degibson84]

Is anyone else noticing the white spots on the zoas. Kind of looks like zoa pox to me

 

[jonlong724]

Haven't introduced new corals. I will try to get better pictures after work today.

 

[jonlong724]

Need to test water parameters too, but it seems odd that water quality would affect just the center portion. That whole area was totally covered with zoas a couple weeks ago. Then they were closed for a few days in the middle, and now just gone.

 

[SloppyJ]

Look at the far left on the picture. Spots all over a few.

 

[jonlong724]

Took some more pics today. I did a large water change and haven't noticed more polyp loss. Do you guys see any pox? I'm looking but can't see any.

 

[A. Grandis]

If you look at the pictures you'll find some small white spots on the closed polyps, yes.
So hard to really know if that's zoa pox, but if you can remove the colony and use a magnifying glass you'll see.

I think it's zoa pox. You need to make sure...
If confirmed, Furan2 treatment!
http://www.zoaid.com/articles004.php

Look like they were growing on a coral skeleton.

Grandis.