zoas not opening and the problem is spreading

[slag009]

It started about 2 weeks ago with a colony of coco pinks not opening. Then it spread to 100 heads of gobstopers (there are only 25 or so now and 5 open) and now 4 other large colonies. I tested water and they all look good
Nitrates 0
phosphates 0
Alk 132 ppm
cal 440
mag 1410
ph 8.29
I dipped them last week and last night with revive. Now only a few heads are opening on some of the colonies. I am thinking of doing 5 min. fresh water dip tomorrow. I have not seen anything on them and I did the night watch with a flash light but did not see anything. I did have a sundial snail (have not seen any more) that I flushed and I had a scutus that I bannished to another tank because he was in the general area. All the other corals SPS, LPS and 4 RBTS are doing fine with no problems. I am including pics they are not the best but maybe you will see something that i missed. Any advice will be appreciated.

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[slag009]

Forgot to mention that I have had all of these in my system for around 2 to 3 months and never had a problem with any of them opening before and have not added anything since. My lighting is LED and colony placement veries. Temp stays between 76 and 78. Thanks again

 

[650-IS350]

Whats your parameters?
BTW- have you seen any of these culprits around your tank?
http://www.coralpedia.com/index.php?module=Gallery2&g2_itemId=384
click each picture to get more detailed pics.

Also 2nd to last pic those zoas on the right dont look good try a Lugols dip on it. If just algae then peroxide dip ( search forum for treatment amount ) or if fungus then may have longer dips and Lugols too. ( or good treatment to is dips in Furan2) http://www.zoaid.com/articles004.php

 

[slag009]

650-IS350 thanks for the links. I have not seen types of pests except for the one sundial snail. As far as the tank parameters I posted them in the origial post.
Nitrates 0
phosphates 0
Alk 132 ppm
cal 440
mag 1410
ph 8.29
temp 76-78

Is there any other reading that I am missing? Thanks again for the reply.

 

[slag009]

Also SG- 1.025

 

[MondoBongo]

I had something similar happen to a small colony of red people eater zoas I had. Luckily it didn't spread, but they all closed up with seemingly no explanation. I'm still looking for a root cause, but I tried a fresh water dip, dip in seachem's reef dip, and several different placements in the tank. They still stayed closed, and I started losing polyps.

My hail Mary was moving them to my qt tank under fluorescent lighting and calmer flow. They finally started opening again. They don't look nearly as good as they did for the first few months I had them, and I lost a lot of polyps, but they do appear to have stabilized.

It is frustrating not to know why it happened. I couldn't see any parasites, my water params were good, lighting and flow were unchanged in the DT, and none of my other zoas were affected. Guess some things are meant to remain a mystery.

Long story slightly longer, if the dips and moving them dont help, consider placing them in a low stress hospital/qt tank.

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