yeah i am very glad your fish got safely through all this, your effort that took them out of it safely, i just wanted to mention here that when doing a water change particularly above 35% or 50% always keep in mind the water temp, any high (a spike high or dive low temp) fluctuation can lead to problems like itch white spot or thermal shock etc, specially when fish is already going through some other kind of stress or disease they are more susceptible to it.
hoping it will help you and all other at times. Good luck