Can anyone tell me what this is , I've been losing fish the last week or so the ammonia was slightly high so I went to shop that told me what to do but I'm wo during if this is the problem. New tank owner
I have seen that type of problem before. Java ferns are very resistant to disease. If an established plant is beginning to turn brown, something is probably wrong in its surroundings. Your plant should fully recover if you make adjustments to elements including sunlight, nutritional levels, planting technique, and any overgrowth of blue-green algae.