Hello everybody! This is my first time here One of my discus is sick I kept fish all my life but never discus. I bought 2 quarter size red melons from local pet store. Ikept them in a 20 gallon tank with no problems. I dont do much as far as water chemestry and maintenece water temp at 86. ph between 6.8 and 7.0 and i change 25% of water twice a week I feed flake,frozen and live with no problems until now. Two days ago the largest stopped feeding, and swam violently,darted and swam flat Tried epson salt for two days. Swimming disorder has stopped but he still does not feed and stays at surface level.

HELP!!!!