The birdsnest is maybe just tougher, in a slightly better spot, etc, who knows. My GBN is solid bright green, about mid level in tank, so let's say 15 inches from the light.
Your current levels are somewhere around my mid sunrise, which is rather dim. Mine are also closer to the water. Get them up to 75/75/60 over the next 10 days or so and re-evaluate. Oh, and my full mid day is about 7 hours...
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Brad
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