Why is my plant turning black? I got it in a 10 gallon tank. I have about 3 inches of perlite on the bottom then peat moss on top of that mixed with some perlite. Then I have some long fibered moss stuff on that with a fluorcenst light above it. I only use distilled water on it. I fed it night crawlers a couple times but it just turned black and now it looks like the whole thing is dying. What should I do to save it?