Hi, I have a tank with standard, narrow and windelov java fern. The tank is 150 litres with a thin layer of red grit at the bottom. All the java fern is growing on driftwood. Temperature is 25C, pH is 6.8, Amonia is 0ppm, Nitrate is 0ppm and I do weekly 30% water changes. I add Flourish twice a week but no CO2. The broad leaf and narrow leaf are doing well but 20% of the Windelov leaves are staring to go brown. I had this problem before and it spread like a virus to all the java fern.
Any one know what I can do to stop this.