Sailfin Tang Diagnosis Needed

[Blakjax]

I currently have a 65 gallon qt set up. I’m running copper power at 1.75 with 4 fish - 2 clowns, 1 longnose, and 1 sailfin. They have been in qt for 5 days (3 in full therapeutic levels of copper). I’ve now noticed this white bump on my sailfin. It’s been there since I got it but seems to be getting larger in qt. Can’t anyone help diagnose it? And help me with the treatment plan? The initial plan was 2 weeks in copper and then tank transfer to prazi for two weeks. And then into DT.

 

[Big G]

Does the spot look cottony, fibrous or cauliflower like in texture? Or is it flat and filmy?

 

[Blakjax]

Does the spot look cottony, fibrous or cauliflower like in texture? Or is it flat and filmy?

It definitely is NOT flat. It protrudes off of it. It’s still eating well and not hindered in any way.

 

[Big G]

Probably lymphocystis a usually harmless virus. Treat by boosting the fish's immune system. Add vitamins to the fish's food. I prefer to add Beta Glucan as it will tremendously boost the immune system. Highly recommend it.