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Possibly ich you’ll have to treat it with copper and move it to a quarantine tank. Cleaner shrimp may not cure it but it's safe to say they can keep it under control and help the fish fight it off easier. No. There is no evidence that they can do either. So a cleaner shrimp may be another possibility, but then you can’t dose copper in your display tank with a shrimp in there.
This appears to be secondary bacteria associated with brook. Need clearer pics to confirm brooklynella. Best treatment is a formalin solution is mixed with in a separate container with either fresh or saltwater. Start with a quick dip in a formalin based bath at a lower concentration in a quarantine tank. The longer the fish are exposed to the treatment the more effective it will be at eliminating this issue.