04-28-2008, 06:28 PM
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Define darker. Are you meaning darker green? What kind of lights do you have over your tank, and what is your substrate? When H. difformis doesn't get enough light, the leaves get darker green and larger. In bright light they all smaller, bright green, and highly indented.
All the Hygrophillias, all stem plants, actually, do best in a fine, iron rich substrate with very bright light; 4 watts per gallon full spectrum via power compacts or T5s, or a combination of both.
That's what you're seeing, no growth, large dark green below and light green closest to the light. Just means your light is insufficient to grow the plant the way you wish it to. Your substrate must be decent enough for it to survive at all.