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The only problem I've had with the Lucas Formula so far is my plants started to suffer from magnesium deficiencies for some reason. I'd keep some epsom salts on hand just in case they start showing signs.
Also, I was never able to get a definitive answer on what PPM levels are appropriate for the Lucas Formula. What are these " TDS @ 0.5 conversion" and "TDS @ 0.7 conversion" all about? Why need to convert to anything when it shows just what PPM my reservoir is right on my TDS meter? Right now my reservoir is at 1000-1200 ppm according to my meter.
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