01-20-2014, 08:13 AM
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without pictures, ...
i'd guess either fungus, your plants are rotting, ... or cyanobacteria.
rotting plants (not likely off the top of my head)
fungus (if you're over feeding)
cyano (sounds like it)
having red your origeonal post again
lighting and nutrients to consider if your plants are rotting
if the lighting is low, ... too low for the plant to maintain itself, ... it's going to die, and plant death could very well be accompanied by rotting parts.
some plants want roots to be submerged into the substrate
other plants if you do this you're going to kill your plant
Rhizome plants , ... it pokes leaves out the substrate, otherwise it's root runner is to be planted in the substrate.
Stolon plants, if you plant it's root runner into the substrate it's going to rot and your plant will die
it's root runner needs to be above the substrate, it will anchor in with proper roots as it grows
(and i don't know why anubias isn't listed in this group as it seems to be how it lives)