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Doesn't Flourish have relatively low NPK?
Yes, very low.

If you don't mind deviating from the purist natural approach, NilocG Thrive C (for low-tech) is a more comprehensive fertilizer. In my experience, it can be a good complement to soil as it also contains an excel-like non-gluteraldehyde based carbon supplement. However, you might want to experiment with doses smaller than what's recommended on the bottle at first, until you get a sense of how algae responds.

I feel there are situations, even with soil-based tanks, where it's valid to think of your substrate as a nutrient source for "grazing" while you "feed" sparingly with a comprehensive fertilizer. It can take a lot of the guesswork/experimentation out as long as you don't feel it's cheating.
 
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