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Some recommendations

Do you perform more than weekly water changes and how much?

Have you tested iron levels in your unconditioned tap water?

Might be a nutrient absorption problem, I've read (Freshwater Aquarium Models book) that too much iron affects nutrient absorption. It suggests 0.5mg/L of ferrous iron for plants.

CO2 is the most important nutrient, so if you have hard water the more CO2 you'll need pump.
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