Cal-mag?? Week 1

Don't add calmag without a good reason. Learned from that mistake unfortunately. If your plant isn't particularly having a calmag deficiency try to avoid giving calmag because the soil usually has enough to last a whole autoflower grow. If there is excess calmag the roots won't be able to absorb the other nutrients and this will result in a nutrient lock down. Good luck with the rest of your grow, hope you find this helpful

You don't need it till down the road. I would do as suggested by Creepysteve and Ezzjaybruh. start feeding calmg about a week out from when the FFOF soil is estimated to be depleted. If you transplant into more FFOF it may not be needed for even longer. Good Luck!

Honestly, I would wait until she is in week 1 of vegetation, at the end of the next 7 days or on day 14, week 2 vegetation. I have to check out huckleberry strains.

99% of cases here, were one or other way calcium deficiency shows up is caused by : A. Notrogen toxicity B. Ph out of range swings Thats it. Just from caution side, i use 3 times max in all life span of plant, with doses not higher than 0.5 ml/L. In soil and with tap water it should not be used at all.

ca and mg are 2 different and uniqute molecules. it can be low on one and have nothing to do with the other. they are both cations (positively charged ions in solution). they have distinctly different symptoms from each other, and one won't show symptoms for 35+ days after the deficiency starts (mg). you should add cal mag if you don't have enough calcium and/or magnesium. simple as that... if it's low in the soil, you need it every time you fertigate -- concentration will depend on need and irrigation habits - fertigation / irrigation with water only cycle often seen with soil grows would impact that.. how often you apply it, obviosuly is part of the equation. the plant sneeds all the nutrients, primary or not, at all times in proper proportions to grow optimally. trial and error to figure out how much it needs. take notes. it might be 40-50 days before you see something that requires a formula change. you'll learn more then 'next' grow when you do it from teh start -- assuming you use the same soil composition and fertilizers etc etc.. trial and error. soil has a lot of unknowns. if you add perlite or similar, that will reduce concentraion or nutes in soil too. all sorts of variables that makes this nearly impossible to say something super specific for your context. i'm not aware of ffof being devoid of calcium or having a need for supplmentation, but i have only used it a couple times. uncut, that soil should have heavy nutes for up to 6-8 weeks, though you may start giving low doses that ramp up as it trickles down at end and ramping up -- and more than just cal-mag product. get a leaf chart... learn the difference between the two. learn the symptoms. observe and react. formulat better plan next time to preemptively avoid any deficiencies or toxicities.

Yeah mate cal mag in the first week for sure especially under LED

Puedes agregar cal mag en la semana 2 cuanto la planta entre por completo en etapa vegetativa 1 vez por semana. Agrega una pequeña dosis y ve aumentando gradualmente mientras pasen las semanas.