that water should be absolutely fine for discus . temp range 28 to 30 is ideal. is this your 1st time with discus?
a good place tostart is 1stly dont get your discusfrom a lfs go to a specialist such as chens discus , discus south , devotedly discus . the fish will be far better quality , better priced and a lot stronger and healthier.
discus from around 4 inches upwards are much much easier than small juveniles , this is a good size range for your 1st group .
feed a high protein good qualiity diet including thiongs such as tetra prima , frozen foods such as krill are also quite good. freeze dried austrailian blackworms are good also ( availiable from discus south)
bloodworm are fine occaisonally as a treat but be carefull with them asthey are pretty poor nutritionaly and fish easily become addicted to them and refuse anything else. thisis a particular problem with discus as they can be very finnicky with new foods once accustomed to a certain diet.
be very careful with livefoods as they often bring in parasites , which discus are particularly prone to. the safest option is brineshrimp .
heres a very usefull guide to what to look for when slecting discus .
http
/www.aquariumhobbyist.com/discus/beginner/index.html