My Java Fern has leaves that are decomposing. These are old leaves. I have new leaves growing really nice lush green but then after a while of growth they start to go through the same process as the old leaves but not at the same size. Would anyone be able to tell me what is wrong with the plant and how it can be corrected. EI dosing potassium nitrate and postassium phosphate and CSM + B(*) to approx same concentration as indicated in the EI dosing article on ukaps. Mon Wed* Fri and Sun* with WC. Dosing 2ml Easycarbo daily and additional CO2 from yeast reactor. Co2 drop checker is green. Weekly 50% water change. 54 litre tank with little green spot algae around the base of the tank. Lighing is T5 2x24w for 9 hours 1x24w for 3 hours(morning, evening).