how big were the discus? for 25.00 they were probably juvies or poor quality. putting two small discus in a community tank could cause a lot of stress. probably not from acclimation. I get my wilds from Fla. to Chicago. I float them for about 20 min. for the temp and dump them in the tank. never lost a fish this way. my ph is 7.6 and I change 60% of the water every 4 days with only tap water and prime. do a wc before they arrive and not again for a couple of days. it's hard to say what killed your fish, but my bet is too much stress, or very poor quality fish. if you want discus, my advice is to get a tank for them, get them from a good source, and get at least six. fish under 3" are much harder to care for and are not good for a community tank.