My bottle of API leaf zone is nearly empty. I can't say it's bad , but I really have to watch my swords when using it. I find the API or certain elements of it get used up quickly and leaves melt. I dose co2 booster and use all low tech plants so I don't need anything too advanced, but I would like to find the next level. I've leveled up my carbon to purigen, my gravel to sand ,bio max to matrix, and stress coat to stability. I've seen great results with all this. What do I look for on the ingredients label of good ferts?
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