09-02-2011, 11:51 AM
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The yellow leaves are nutrient related, but I am not certain the light "increase" is necessarily responsible. What are the light specs (type of tubes, number, watts, K, etc)?
For the amount of plants, I would do twice weekly Flourish, though I may change that opinion when I know the light specs.
What is your water hardness and pH? Valls always do better in harder water, though they can manage in soft as mine are.
How long has this tank been running with the Eco-complete? It takes a while to get going.
Nice aquascape though. The only plants i would add are floating, you definitely need some for the angels to shade that light a bit. I agree, duckweed would not be my choice in this setup either. Pennywort will work, as will Water Sprite. Both will grow well and need weekly trimming/pruning during the water change, but that is fine.