My Java Ferns have been deteriorating for a while now. It's been a gradual process, and perhaps it's part of a natural life cycle - which is why I haven't done much about it until now. The leaves are spotted with holes and brown spots. Many of the smaller leaves went brown/yellow and died.
However, I've been thinking that although my water has tested quite well in terms of pH, ammonia, nitrates and nitrites, perhaps I haven't been doing enough water changes. So that's the first thing I've done.
I also have some black (red) brush algae on the leaves, and I decided to kill the algae with a water/bleach soak. I'm also going to adjust my fertilizer and see if I can do something that prevents adding iron to the water.
The tank is getting 9hrs of light with a daylight bulb, and some daylight as well (it's not by a window but it is in medium bright family room.
Finally, I wonder if there is a phosphorus deficiency. If anyone has seen this type of behaviour, please let me know. I have Amazon swords that are doing well, and some Anubuias that is also a bit brown like the Java Fern.