Looking for help with disease ID and treatment (videos attached)

[MikeTheNewbie]

Hello fellow reefers, I have a brand new 200 gal tank waiting to get its first inhabitants and I decided to start quarantining 10 Chromis I got from my LFS.
I followed a quarantine procedure I found here including Copper Power and General Cure dosed to the water column as I couldn't get them eating treated food.
After a few days I noticed one of them developed a small bulge in the forehead but I didn't do anything since I thought Copper would take care of it.
Here is how it looked like


A few days later, the bulge was gone and the fish died soon after. After 2+ weeks I was left with 3
The looked healthy so I did a transfer to a brand new copper free tank.
Unfortunately 2 days ago I noticed one of the remaining 3 developed another bulge.


Can anyone help me identify the disease and the proper treatment? Any way to avoid infecting the others?
@Jay Hemdal or any other experienced reefer's help will be greatly appreciated.

 

[Jay Hemdal]

Sorry, I’m not sure what that is. Uronema is really common in new green chromis, but these lesions don’t really resemble that. 7 out of 10 have died? I wonder if it is an acute bacterial infection? Are there any other fish in with them?

I’m really down on green chromis right now. I think the supply chain has gotten longer due to COVID, and this species just can’t tolerate it....so many people are losing entire groups of them.

Jay

 

[MikeTheNewbie]

Thanks for the help Jay. 7 out of 10 have died.
They are/were my first fish after many years of being out of the hobby.
All tanks and equipment were brand new and no other fish are there.
I originally thought it was some sort of a cyst from which pathogens came out and that first fish infected the rest. But now that you mentioned lesions, I remembered that all the deaths happened a few days appart from each other. Also at the beginning everyone was feeding eagerly at the same time but after a while I noticed one of them became dominant and was "scaring" the rest during feeding time.
Maybe that one has been causing the lessons one by one?

 

[Jay Hemdal]

Thanks for the help Jay. 7 out of 10 have died.
They are/were my first fish after many years of being out of the hobby.
All tanks and equipment were brand new and no other fish are there.
I originally thought it was some sort of a cyst from which pathogens came out and that first fish infected the rest. But now that you mentioned lesions, I remembered that all the deaths happened a few days appart from each other. Also at the beginning everyone was feeding eagerly at the same time but after a while I noticed one of them became dominant and was "scaring" the rest during feeding time.
Maybe that one has been causing the lessons one by one?

Yes - that could be. For a normally "schooling species" green chromis do fight a lot. That said, the location of the lesions aren't quite where I'd expect to see them from fighting.

Personally, I'm not acquiring any green chromis right now, unless I get the larger ones from Tahiti. Pre-quarantined might be an option for you - the high mortality I see happens in the first 45 days, so that would be mostly on the dealer then.

Jay

 

[MikeTheNewbie]

Yes - that could be. For a normally "schooling species" green chromis do fight a lot. That said, the location of the lesions aren't quite where I'd expect to see them from fighting.

Personally, I'm not acquiring any green chromis right now, unless I get the larger ones from Tahiti. Pre-quarantined might be an option for you - the high mortality I see happens in the first 45 days, so that would be mostly on the dealer then.

Jay

Thank you very much Jay!