Why Is My Java Fern Turning Black? The Deep Dive into Microsorum Pteropus If there is one plant that every hobbyist starts with, it’s the Java Fern. It’s the “unkillable” staple of the freshwater world. But then it happens: you look into your tank and notice those lush green fronds are developing ominous black spots, or worse, the entire leaf is turning into a dark, translucent mush...