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A diet of mostly pellets and only about 15-20% seed (less as the bird gets older), a nice big cage with a lot of interests for them to explore and do (change the interior around on the first of the month every month to keep it challenging), plenty of fresh foods like orange colored vegetables (squash, carrots, sweet potatoes/yams) and whole grains.
You can see more details about nutritional options and even how to switch to pellets here 4AnimalCare
I hope your little one is ok
also if a heart had a heart problem or heart failure, would you hear the abnormal breathing all the time or off and on?