Hello all, seeking advice.

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aminik

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I have noticed holes developing in this Acan coral over the past 48 hours. The coral survived a red slime bacterial infection treated successfully two months ago. Was actually showing signs of growth since then until I noticed these holes developing. I was instructed by the shop that services my tank to dip it in a solution consisting of a mixture of Reef dip, coral Rx and flatworm exit. During this process I noticed that the defects go all the way through the skeleton of the creature to the other side? I did not notice any parasites escape. I am wondering if anyone has seen this and what the cause might be. I tried to attach some pictures. The tank is 220 gal, most coral doing very well as are 5 tangs, 2 clowns, 10 chromis, single banded shrimp. Last check 2 days ago paramaters showed high Magnesium 1600, Ca 460, Alk 10.4. Thanks in advance.
 

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Update... After re inspecting the coral to take more photos, i noticed something moving in one of the new holes, it appeared to have a shell like a long clam of some sort. Not knowing what to do i stabbed it with a needle and removed most of it piece meal with forceps. I then poured a few drops of the iodine solution and Coral Rx from the under side where the holes were originating hoping to kill whatever was left. Is this a known parasite or did I unknowingly remove a part of the actual coral?! Pictures attached.

20200405_195549.jpg 20200405_201424.jpg
 
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aminik said:
I have noticed holes developing in this Acan coral over the past 48 hours. The coral survived a red slime bacterial infection treated successfully two months ago. Was actually showing signs of growth since then until I noticed these holes developing. I was instructed by the shop that services my tank to dip it in a solution consisting of a mixture of Reef dip, coral Rx and flatworm exit. During this process I noticed that the defects go all the way through the skeleton of the creature to the other side? I did not notice any parasites escape. I am wondering if anyone has seen this and what the cause might be. I tried to attach some pictures. The tank is 220 gal, most coral doing very well as are 5 tangs, 2 clowns, 10 chromis, single banded shrimp. Last check 2 days ago paramaters showed high Magnesium 1600, Ca 460, Alk 10.4. Thanks in advance.
Click to expand...
Looks like a lobophyllia (open brain) not an acan. Gall crabs tunnel into lps corals, but your pic looks more like a worm. Might research larval stage of this animal, but probably something else. Good luck
 
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