If you want to take a closer Look or get more knowledge about how Nutrients work with your Plants, i highly recommend watching this
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CalMag defiencies are not to common if you use Tap Water. If you use RO Water you need to add CalMag. Make sure you don´t have a P deficiency. If there is not enough P, uptake of Calcium and Magnesium will stop. Plants do need a little more P too when they are young. This helps Root growth and gives the Plant more Energy. If you are running Autoflowers, i recommend you to use Bloom Nutes from the beginning on, or the whatever Solution you have to give them in Bloom. But don´t add PK 13/14 or stuff like that, this is way too hot. Bloom Nutes are usually higher in P and K than in N, and this is exactly what you want. Just start with a small Dosage and give them a little more each feeding till you reach that point where it hits the sweet spot. Just dont do too much. And dont forget to give your Ladys Time to respond. You should be able to see results within 3 Hours after Feeding
Edit: N deficiency shows as a general yellowing beginning from the Bottom of the Plant, while P and CalMag issues shows as a yellowing on top of the Plants. Also Magnesium def shows of at least 4-6 weeks after the def started. Because of your Plants are too young, this can´t be the Point. Do you see those Petiols and veigns turn purplish at your Ladys? This is a clear sign of P-Def. Add more P instead of CalMag Brother!
