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That infestation is severe....I agree you have to get him and the rest of the fish out to treat....at minimum, I would suggest a freshwater dip and a formalin dip for starters...hopefully humblefish and meridith have some better ideas of what it might be.
I don't recommend formalin often, but I do think I would go that route in this instance. Do a 5 min FW dip, followed up by a 45 minute formalin bath and then place the fish in QT. How he looks following the FW dip + formalin bath will tell us whether those "things" are something worm-like or an external parasite or possibly not a disease at all.