Thank you for the response. I ordered some metheleyne blue just in case.
Do you recommend any fish with a scale injury or "nick" from rough housing should be quarantined and treated this way? Or only if it shows a fungal infection or sign of weskness/not eating?
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This injury in particular looks like it could become easily infected with secondary bacteria/fungus. I would recommend keeping it as clean as possible. If you can do the water changes and salt in the display tank- that's fine too.
Anything further than that will need to be done in quarantine.