Thats what is required for juvenile discus, they are an extremely advanced fish to look after and require time and dedication. I know several fishkeepers who have kept fish for 10 years+ and still wouldn't consider themselves experienced enough for discus.
As has been said before about many fish, surviving and thriving are 2 very different things. You need to be aiming for your fish to thrive not just survive.
There is a discus keeper on this forum who changes 100% water daily for his juve's, cant remember his username.
Andy