Java Fern turning black


I have had the same problem with Java Fern dying off in several, but not
all of my tanks.  I notice a seasonal cycle:  it happens in late
spring/early summer.  There are no other correlations that I can
discern.  It never happens to the "Tropica" variety, even if it is in
the same tank as the other species that are dying off.  Very puzzling.

- Jack O'Leary
Ask not what your village can do for you ...