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Old 08-18-2015, 02:12 PM   #1
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Zoa colony dropping polyps and mostly closed

So the title says it all, I had them for a few days then I went to the mountains and when I came back the colony was had about half the polyps open so I thought it was probably a hermit crab. The next day I noticed more were closed and it had dropped a polyp. It was still open so I glued it to a frag plug. That day I did a water change of about 15%. After no improvement I dipped it in revive which knocked off some small black bugs (I think they are nudibranch)There was still no improvement so I went for a second dip today and in the process a second polyp fell off. They are under the 120 watt Chinese LEDs. Moderate flow and so on. The tank has been up since last November.

Parameters:
Salinity-1.025
pH-8.2
Ammonia-0
Nitrite-0
Nitrate-0
Calcium-460
KH-7
Mg-1320
Phosphate-0

Before:

After:

Thanks in advance!


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Old 08-18-2015, 02:25 PM   #2
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Have you tried moving them to a different light/flow zone in the tank? Usually zoa eating nudi's will be the color of the zs they eat, where the "bugs" that came off in the dip the same color?


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Old 08-18-2015, 03:02 PM   #3
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I would leave them be for acouple days/ week could be just stress from the new environment. That happened to some button polyps I got awhile back. They opened the first day I got them then slowly one by one they all closed and stayed closed for almost a month and some fell off. I thought they died and I was ready to throw them out but they all bounced back and look good and healthy. I actually had to separate them because they were taking over my tank


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Old 08-18-2015, 03:55 PM   #4
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never had luck with zoa's in the sand , try moving them up they don't seem happy were they are now
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Old 08-18-2015, 04:26 PM   #5
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If you do move it let it stay there for a week or so to much change over short periods of time will likely stress it more then it is already. I honestly think it's best to leave them in a lower flow area with lower lighting. Your tank seems healthy so I wouldn't be worried about them dying. They look healthy and when they feel the need to get some light they will open. Once they do open is the best time to move them this way you will know if they are happy with the new area that you put them in. If you move them to higher flow and lighting while they're closed you won't know if your stressing them and could ultimate kill off the hole colony


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Old 08-18-2015, 08:22 PM   #6
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Thanks for all the responses!
The little "bugs" we're a blackish color and about a mm or two long.
I moved them to the bottom left corner of the tank (still on the sand if not happy I will move them off sand in a few days).


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Old 08-18-2015, 08:36 PM   #7
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I doubt the bugs are anything harmful and probably pods of some sort...if you want to be careful, just do a dip in coralrx.
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Old 08-18-2015, 09:08 PM   #8
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They were more like slugs than bugs


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Old 08-18-2015, 10:16 PM   #9
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Then I would def do several dips in coralRX.
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Old 08-19-2015, 02:38 PM   #10
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Put a microscope lens over phone camera and got this picture of the slug like thing.



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