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Re: PMDD-When to start

At this point (two days) the plants are still in shock and not using any
nutrients. I'd wait until the plants have thrown some new leaves, maybe a
week or so. Then -slowly- ramp up to the minimum dose needed to keep them
going. As you add fish and fishfood, you may not have to add N. With
Fluorite, it is my understanding that the water column Fe is not too
relevant, especially if you have mostly root feeding plants.

BTW, how do you know K (potassium) levels? Is there a test kit now?