Welcome to ac,
First of all some details about how long the tank has been up and running, and chemical test results of your water and water temperatures would be helpful, also you will get far greater responses posting your questions in the fresh water sections. If things get desperate, pop on in flash chat, usually one or two experienced discus keepers will be in there.
I don't know a whole lot about discus, but i may be able to help you trouble shoot and diagnose the issue...