I have a small planted tank containing one Betta and an apple snail. It's fully cycled and been set up a good while now. The light is a long tube light and it's only 6W. I have it on from about 4pm to 12am. My anubias is doing well but my Java fern seems to be turning black on the longest leaves. I've tried wiping the leaves but it won't come off. It's looking a bit rubbish lately because of this.
Here's a pic, I just cleaned it so it looks a bit cloudy still from the water change an moving everything around.
I also have another small Betta tank an the Java Fern in there is starting to go the same way. The light is on for 8 hours. Maybe I should have the light on in the day for 8 hours instead of the evening? I usually start off about 4pm to 5pm and leave it on for 8 hours from then.
Does anyone have any ideas? Should I reduce the light?
Here's a pic, I just cleaned it so it looks a bit cloudy still from the water change an moving everything around.

I also have another small Betta tank an the Java Fern in there is starting to go the same way. The light is on for 8 hours. Maybe I should have the light on in the day for 8 hours instead of the evening? I usually start off about 4pm to 5pm and leave it on for 8 hours from then.
Does anyone have any ideas? Should I reduce the light?