Would move the fish to quarantine tank if possible ,and treat with Anti-parasite medication (PraziPro) or Seachem (Paraguard) as per directions. (more is not better).
Would perform daily 30 percent water changes for a week or two.
Would see that water parameter's are zero for ammonia and nitrites, and nitrates no higher than 20 ppm.
Would see that temp is between 82 and 84 degrees F (raise slowly if needed).
Above is what I would do were they my fish.
Is always wise to quarantine new fish before introducing them to main tank. Placing them in smaller quarantine tank makes medicating if necessary ,cheaper (less medication) ,and water changes are easier (less water).
Eye's could have been damaged, scraped,when fish were netted. Clean water and lot's of it should always be first line of defense to prevent infection's/bacteria from developing.
White growth looks to me to be parasitic , and afore medications should prove beneficial. If fish are eating,then mixing medication with foods can be best approach but often new fish will refuse foods for first few day's to a week and should this be the case,,treating the Water becomes necessary.
Variety of foods rich in protein are helpful for growth of young Discus
, and young Discus
should be fed three to four Small feedigs each day taking care to remove any uneaten foods within 30 min of feedings in my view /expierience.