We are new in discus keeping, and one of our new discus has gone very dark in color and his eyes are also dark, and he is shuddering. We are naturally very worried! We have turned the lights off on the tank but would like to have an idea what is wrong.
1. Put the snakeskin to quarantine in the hospital tank. Treat her with Acriflavine solution plus salt
2. The other fish in the main tank you can treat them with Formalin. Dosage: 100 liters of tank water / 2 to 3 ml. of Formalin.