Discus Compatibility Help please?

if you want 4 discus you should have at least 75 gallons(285 litres). A 100 gallon(380 litres) would be better. you could keep up to 3 discus in a 200 litre tank. You could keep them with 3 angelfish in a 200 litre tank as tank mates. 200 litres is 53 gallons. you can keep them with all those other fish except the cherry barbs, they can nip fins.