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My Tank Thread
That looks like early brook to me. It may ALSO have ich but I am almost positive it has brook.
You need to remove all fish and treat them in Metroplex (for brook) and Copper Power (for ich and velvet) for 14 days and then transfer to another sterile quarantine tank for observation.
You can also do metroplex for 14 days and Copper Power for a full 30 (concurrently) if you only have one tank. Run the tank fallow for 76 days or this will re-play.
You need to remove all fish and treat them in Metroplex (for brook) and Copper Power (for ich and velvet) for 14 days and then transfer to another sterile quarantine tank for observation.
You can also do metroplex for 14 days and Copper Power for a full 30 (concurrently) if you only have one tank. Run the tank fallow for 76 days or this will re-play.