Hi and welcome to SD!
It is good to ask your breeder what they were fed so you can use the same. I would not be adding any medications, however growing discus needs lots of big, daily water changes. As they are fed multiple times per day, they are creating lots of waste , hence the need for the water changes.
My lot are obsessed with Australian FDBW, but I will occasionally starve them and put in some tetra color bits or something like that.