It is a 10 gallon with a 30 watt light. I dose liquid co2 daily. I don't dose ferts yet but i've already ordered them online.
My other java fern is starting to get this. I have a substrate mix of eco-complete and sachem flourite. My crypts, java fern, and aunties are also starting to get this brown outline on then too. Could this be because of too much light?