Had a outbreak of fungal disease, didn't have any problems until I decided to add a female EBA . The EBA stressed out a Rainbow fish first, and the trouble began when I noticed a Panda Cory showing signs of fungus on its fins 
eventually lost all 3 Panda's. The aquarium had plants in it so didn't want to medicate with anything that would harm the bio bacteria or plants added Pimafix, and Melafix which didn't do much. So noticed my Emerald Cory I have had over 10 years was acting listless was frantic ,and the decision was made. I read where Cory Catfish were sensitive to salt but added about 3 teaspoon of Aquarium Salt the next day notice my Sterbai were showing symptoms so added another teaspoon. After 2 days did a wc after 3 days I'm happy to announce that they are now active again.
eventually lost all 3 Panda's. The aquarium had plants in it so didn't want to medicate with anything that would harm the bio bacteria or plants added Pimafix, and Melafix which didn't do much. So noticed my Emerald Cory I have had over 10 years was acting listless was frantic ,and the decision was made. I read where Cory Catfish were sensitive to salt but added about 3 teaspoon of Aquarium Salt the next day notice my Sterbai were showing symptoms so added another teaspoon. After 2 days did a wc after 3 days I'm happy to announce that they are now active again. 
