Your Java fern looks healthy. It is common to see spots like these as the leaves age. Java ferns propagate through the leaves, this starts out as a spot usually black, that begins to grow roots. and then little leaves will start to show up. I had one Java that got to look pretty nasty because of all the black roots and then it just doubled in size as the new leaves grew bigger.
PS. Nitrate- 120 way to high... Kh-40 is this ppm or unconverted. My KH unconverted is 15, converted to ppm = apx 236ppm off the top of my head
Nitrate need to be between 10 - 20
My KH and GH run between 200 -250 ppm
Javas an Anubis prefer harder water
75 Gal High Tech Planted tank, 37 gal Low Tech
Last edited by Darkblade48; 12-24-2015 at 02:06 AM.
Reason: Please use the edit function for back to back posts