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Look at your plants and they can tell you. If the tips are browning and looking burnt, your nutes could be too hot.
My understanding is that different strains have different tolerances, so what is a good ppm for my plants may not be so good for your plants. I have read that 800-1600 is ideal for most strains, and if you are @1500 and aren't seeing burning starting at tips, I would equate the stress to something else (or a combination).
I don't measure by that method so I cannot answer you right off.
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