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You should be dosing all the nutrients (N,P, and K, AND the micros AND iron). The roots tabs will help the heavy root feeding swords.

"Several years-old" Flourite is a good substrate for root growth, but it will not provide any nutrient to your plants. It can hold nutrients that you add and make them available to the plants, but it does not contain anything.

You also need a carbon source. This can come from CO2 (either pressurized or sugar/yeast generated) or you can use Flourish Excel.

Am I seeing that right about GH 300+ and KH 40? Is this your tap water? Is there anything else in that substrate?

For the algae, you can beat it by proper dosing of ferts. and carbon.

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