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I got 6 corys yesterday in the mail. One of them has white fuzz on its back. It’s not splotchy or patchy. It could be slime? Is it bacterial? The fish seems OK but is definitely low energy. Water parameters are all 0. Ph at 7.
Could be fungal or bacterial. Treat with hikari ich-x or kordon rid ich plus for fungal first, since it is cheaper. Find out how well corys tolerate that med, it might be a reduced dose