How long have you been keping fish? Personally i wouldnt recomend discus to anyone with less than 3 years in the hobby because as mentioned they are a little bit harder to keep than most tropical fish.
Firstly they need soft acidic water, i have heard of people keeping and breeding them in water that is moderatly hard and alkaline but ideally you want to keeping them in water with a pH 6.5 and hardness not exceeding 5 dGH. Next they are very sensative to nitrates, levels of nitrate need to be kept below 30ppm at all times, this is one of the reasons that many discus keepers and breeders use bare bottomed tanks as they are easier to keep clean, you will probably need to do two water changes a week and may need to buy your water in if your tapwater is unsuitable.
Discus are very shy and do not like overly active or large tankmates, keep tankmates to tetras,corydoras and dwarf cichlids if any, frightened discus have been known to stop feeding and starve to death, they also preffer higher temperatures than most fish (30oC) so this must be taken into account with tankmates too.
Discus appear to have a higher metabloic rate than most tropical fish and need to be fed on good quallity high protein food to keep them at there best, specialist discus food and good quallity live foods (which have been sterilized first) are the most recomended..