Do I read you only have one discus in your tank now? If that's a yes take the one to the LFS and see if they will buy it and start over with more than two. They like larger groups. And this time daily water changes of 50% and feedings at least three times daily. If you don't have the time make time. If u can't make time you will see the same problems over and over.
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-Brandon
Yes i have only one discus now with a pair of angles and some schooling fish,
he's doing great and eat what i give him.
i'm also planning to buy more.