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"Plant Nutrition" is K
"Plant Nutrition +" is N+P

but you still need micro's and C02.

I don't think Tropica is any better or worse than the Flourish line and personally I like's NPK+M products better since it has the same results when used with Excel in my low-light tanks and lasts longer (when I buy it, I switch back and forth from dry to it so it probably lasts longer for me).

- Brad
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