Java fern rhizome turning brown and yellow
I had quite a few java ferns with good amount of rhizomes. Trimmed all the leaves 3 months ago as the leaves were getting full of holes and black/brown patches. Now small leaves have started to appear but some of the rhizomes is developing brown and yellow areas. What is going wrong? I dose Seachem Flourish and API leafzone on alternate weeks after a 30% water change.