Okay so I have a 55gal freshwater tank and one of my cory catfish appears to have SBD because it can’t swim around the tank without doing a 360 and my male swordtail I think has Dropsy because it was just sitting at the bottom of my aquarium and it’s scales are all puffed out...I quarantined the swordtail but idk what to do with the Cory?? And I don’t know how to treat dropsy correctly either, and suggestions?