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We had talked just briefly on the bottle of Rapid Start. Should I avoid this for now? It's 1-.5-1 I believe.you can start now but keep it very low ppm - like 150.
Your cotyledons are still doing great. If the plant needs nutes (mostly N at this point) it will start to steal from them. If they start to brown up, you waited a day too long for perfection. Perfection is not needed.
A dash of cal-mag, some grow, and that's about it for now. Growth is currently focused more on roots, they will stretch looking for food and water, that is a good thing. Too much nutes and you can do more harm than good.