Java fern deficiency?

[PheonixKingZ]

Light may be too intense for Java Fern; it is a shade plant. Floating plants can help with this. Light duration of 12 hours is a lot, my tanks are on for 7 hours.

The above are general comments but could be part of the issue. Something else hit me, the iron (Fe) in the linked plant fertilizer is given as 0.00% on the website, can you check the label to see if this is correct? Lack of iron can cause yellowing leaves, but so can many other things, but something is not right here; I don't know why they would list iron if none is present.

I agree, I have a lot of floating plants to help with that. I suggest it actually.