Temp dropped...Discus not happy

[pinkrblu]

The heater on my 29 failed sometime between yesterday afternoon and this morning. I usually keep it at about 81, but when I fed this am it had dropped to 74. I replaced the heater immediately and started slowly bringing the temp back up. The cardinal tetras and the clown loach are all fine, but the discus doesn't look so good. It is resting on the bottom, hiding in a corner. Here's hoping...