CBB black mark or dorsal fin in QT

[wlj3]

Looking for some advice on what this black mark is on my CBB. Fish has been in Cuppramine @ 0.5 ppm for 17 days with 2 doses of Prazi. Thanks.

 

[nautical_nathaniel]

I don't think I've ever seen anything like that, besides fish being stung by something, but it being in a QT tank has me stumped.

Let's see if the #reefsquad can help out

 

[Abhishek]

Well I would keep feeding him heavily for now with food soaked in selcon or any vitamins .

Looks like lymphocytes which are common with CBB but I might be wrong !

Nothing alarming looks to me !

Regards,
Abhishek

 

[ngoodermuth]

I think most likely there *was* a fluke or parasite in that location and it’s developed a slight reaction, possibly bacterial. At this point, it wouldn’t concern me too much. I would just keep on your current course, and feed vitamin or selcon soaked foods in small frequent amounts.

Keep an eye on it. If the “black” area gets larger, tissue starts to recede, or he develops red or white patches, labored breathing etc, then antibiotics would be in order.