Harlequin Tusk in stingray tank

bk.webbx3

New Member
My harlequins fin has a white coating over it and not sure on what to do. He seems to not be using it as much as other fin. I looked up finrot and doesnt look like any of the pictures. Before I got the ray I treated the fish in the tank for ich and thought it was gone but this looks almost like a white film over his entire fin. I am unable to really use medicine because of the stingray. Almost all the medicine I have looked at has cooper in it so kinda slim on what I can use. Do I just pull him out and try something like fin rot meds? I do run charcoal in filters. I have 2 250 gallon pumps with plenty of waves in tank.
 
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