first soil grow

Depends on the soil and nutes. With decent soil and Mega Crop, maybe not necessary even with LED. With other soil and other nutes with less Ca, maybe needed. It is cheap enough, so having it around just in case would be a good idea. Sooner or later, you will likely need some.
 
I've had better results using it at every watering with coco/perlite/cool terra mix .
 
Calcium and Magnesium are both already in a every soil and almost every bottled/bagged nutrient line. I only add what's needed when it's needed. I let the plant tell me what it needs and when. Keep in mind that CalMag is a sales product/term. If you need calcium, I'd add calcium.. If you need magnesium, Id add magnesium. Adding both when only one is needed, or adding both when neither is needed, can lead to issues.
 
Calcium and Magnesium are both already in a every soil and almost every bottled/bagged nutrient line. I only add what's needed when it's needed. I let the plant tell me what it needs and when. Keep in mind that CalMag is a sales product/term. If you need calcium, I'd add calcium.. If you need magnesium, Id add magnesium. Adding both when only one is needed, or adding both when neither is needed, can lead to issues.
Thank you for your rerply very helpfull
 
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