yeah, again shows the importance of quarantine. I used to get these garbage disease when I didn't practice quarantine very well. Although I also notice my "black ich" never really broke out to other fish, and also disappeared from the tang after a while. I attributed it to my cleaner shrimp/wrasse, but not 100% sure if they are the reason to help eradicate.Black ich (turbellarians, a worm) is just easier to see on a yellow tang, because of the contrast of color. It can be cured with prazi.
Black Ich (turbellarians)
Black Ich (turbellarians) What You Need To Know: * Parasitic flatworm infestation; tangs are most often afflicted. * Primary symptom is small black dots on the fish. (Not to be confused with Clownfish Hyper-Melanization.) * Best chemical treatments for this disease are Praziquantel and...www.reef2reef.com