Some back round info. I have years of experience with fresh water and took the salt water plunge a few months back. My ammonia-0 ph-8.4 salinity between .023 and .024 and nitrates stay around 20. I added a hippo tang a month back and after a week or so he was rubing hard on rocks separated him after giving him a fresh water dip and the rubing stoped but a week later he was swimming upside down and later died. A week later my naso tank was in the tank on his side and later died. Now my yellow tank started rubing a week ago fresh water diped him he stoped was eating fine and today he laying on his side and appearewd to be bleeding from his mouth. At close inspection i see many tiny black spots on him but very very small only visible once i took him out of tank and shined light on him. I'm guessing flat worm. Can any one help to save my other fish with some form of treatment
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