Thanks for the advice man. Really appreciate it. The cyst seems to be going down already. I will try catching them for quarantine as soon as I ensure my qt tank is hundred percent. Thanks again. Should I use copper to treat in the qt?
If the powder Brown got whitespot, then the yellow will also get it. The white cyst might be fungus, and would sort itself out if fish immunity is ok. But pictures helps a lot. Best is to QT all the fish, first with the bucket method, then into a holding tank.
That is what I would do. I do not believe that there is a cure for whitespot in a display tank