The others are right, most of your fish won't work for discus. Keep discus water 82-86...88 is too high as the oxygen carrying capacity of the water will be too low...82 is really the best to aim for.
Peaceful, calm fish are the best for discus. I have kept them with plecos, rummy nosed tetras, rosy barbs, corries and angelfish. Also rams, keyholes, and apistos.
If you keep them in a planted tank you don't nees to do as many water changes. I used to do twice weekly water changes of 50 to 80%.
I tried many things with discus in the 25+ years I kept them. While BB is easier to take care of, planted tanks are more pleasing, and bb is just boring.