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Can't tell for certain from the photo. Could be Lympho: https://www.reef2reef.com/threads/lymphocystis.257461/
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Wow what a beauty. Could you get a photo of him head on, to see if the bloches are raised off the skin? The top fin does look damaged also![]()
Losing the male. Any I'd on the issue! Uronema?

X2 those fish appear seemingly healthy and even have all of their color almost. I think velvet or other diseases infecting the gills is possible but they would lose more color typically IMO. Could be ammonia and velvet, and since you didn't treat with copper or CP that actually would make more sense.Ammonia is first on my list here. Followed by the possibility of an infection or uronema. I have a difficult time with both infections and uronema with anthias at the store. They come in with these things and start dying after a week of being (i thought) fine.
This was the male. I thought ammonia too but three died same time. Stop eating the morning before. He wasn't dead this morning but I doubt he will make it.X2 those fish appear seemingly healthy and even have all of their color almost. I think velvet or other diseases infecting the gills is possible but they would lose more color typically IMO. Could be ammonia and velvet, and since you didn't treat with copper or CP that actually would make more sense.
Initially I thought against velvet but the more I think the more I may agree with humble although typically fish that die of velvet are far less "attractive".
If you have a microscope, you can do a scrape of that white patch, wet mount it and examine it for pathogens.
Thank you for your help.Agreed. My guess is its something bacterial in nature.
I've read over some of your articles and they're very helpful. I know prophylactic treatment is personal choice but assuming that prazi took care of worms or such, would you recommend treating with a gram negative immediately after even if no symptoms arise?
Can you point me to an article you've written about QT methods that include recommended treatment patterns without symptoms?
Unfortunately, antibiotics are the harshest chemicals we use on fish and also deplete the most oxygen.

