White and black growths on my bristle nose plecos

[Derp]

Bought a 65 g tank off some one i noticed the growth when i got it.
He's in the 65 g fish tank with a bunch of his baby's and 2 other bristle nose adults, 3 red phantom tetras, a blue paradise, and a glass catfish.

I have no idea whats this is, the only thing i can think of would be a fungus
So I've been treating with pimafix. If anyone could help that would be awesome


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[Derp]

Pimafix did not seem to help, anyone have any ideas?


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[Delapool]

My thought would be a fungus as well. Could the dark patches be tank sediment caught up in it?

I'd give up on the pimafix, shift to QT and try a fungal treatment med.