seeing little black spots

[aprilabaxter]

My tang has ick and when I treated the tank with copper and formaldahyde the spots disappeared. He now has little black spots in some places. What are these?

 

[grateful1]

omg u are seeing spots before your eyes!! jk
i think there is such thing as black ick.

 

[beth]

Black ich. Formalin bath for 45mins, every other day, 3-5 treatments.

 

[simm]

What causes this?