Everyone has different statements on how to keep Discus
But its always recommend keeping them in soft water, 5+ school of Discus in a tank no smaller than 60US gallons is recommend
Clean water is a must with at least 2 PWCs a week with one being at least 50%, the temp at 82-87
Feed them plenty in order for them to grow big & fat, & not have any growth issues
Suggestions would be bloodworms, live blackworms(careful with parasites), beef heart & veggie based foods (flakes, wafers) 3 times a day
I'm sure there's more to be said but nothing else comes to mind atm lol