I don’t keep discus but don’t they require special water parameters?
They typically require warmer water, which I like my tanks around 83* anyhow. Some people fight pH and all that jazz. Stability is much more important than fighting pH. They are more sensitive to nitrates than most fish, but I will be changing 25-30 gallons of water per day to keep pristine water. Wild caught discus would probably matter more, but these are captive bred and will be more used to it.