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I need some help with H.z.!
New leaves grow green but as they become older, they turn black, as if they
were damaged somehow. They are in full light, and everything else in this
tank (2 dozen or so species) grows very well.
Could it be the current? Low Ca-levels? Too much iron (at .1-.2 ppm)? Any
"Things that matter most must never be at the mercy of things that matter
least." J.W.von Goethe