Add cal mag with sensi coco ??

It is too early to fertilize, ideally it is from about 3-4 weeks when the growth will be stronger if the plant is growing in the ground, if it is coco then you need to fertilize from 2 weeks.

coco coir is inert, so you need a full diet provided in a soilless context. You'll want at least 100ppm of Ca, and possibly more. Simply use the gauranteed analysis labels and a free app to calculate and tabulate your ppms per nutrient molecule. If it spits out a value for Ca that is nowhere near 100ppm, you should add some cal mag. Can use that same app to figure out how much to supplement what is already included in other products. Any self-respecting fertilizer setup for soilless/hydro shoudl have calcium in it. That's just utter incompetence if it does not or a business ploy to get you to buy more bottles of fertilizer for no reason. there shoudl be very little need for more than 3-parts to any fertilizer. Beyond dthat is just intentionally trying to milk people of their money, lol. Calcium is often isolated in a single part due to the fact 100x concentrations can cause a precipitate. Once mixed at normal-use concentrations it's fine. Regardless, it should be included one way or another. Not doing so is setting people up for failure. look into the fertilizer setups that have Caclium nitrate as "1" part. Never have to buy some extra product for caclium with that in use and provides the fastest acting N you can give. Soiless: 1) fully fertigate with 10% runoff waste each and every time. 2) wait for dryback and repeat. It should be a full diet every single time. You don't add calcium here or there, it should be ever-present in the mix provided. You give a full diet each and every fertigation. The runoff ensures buildup does not occur over time. Observe and adjust formula until you grow nearly flawless plants... May need slight adjustments in flower phae, but nothing crazy. Maybe, 20% less N, give or take... maybe a much smaller tweak elsewhere.

Hey Bro 👊 No worries, she looks good so far. You can start using CalMag right in the beginning with each watering, I do the same. I personally use 0,5 ml in grow and 1 ml in flowering / Liter. Did you use pure Coco with perlite, or is it soil mixed with Coco and perlite (Coco Kaya by BioBizz like)? If it’s soil + Coco I would not suggest to start fertilization too early as those mixes are mostly pre fertilized. If it’s pure Coco you definetly have to feed with more than only CalMag as suggested by others before. Hope that helped 👊 Happy growing 🍀🖖

Hey Bro 👊 No worries, she looks good so far. You can start using CalMag right in the beginning with each watering, I do the same. I personally use 0,5 ml in grow and 1 ml in flowering / Liter. Did you use pure Coco with perlite, or is it soil mixed with Coco and perlite (Coco Kaya by BioBizz like)? If it’s soil + Coco I would not suggest to start fertilization too early as those mixes are mostly pre fertilized. If it’s pure Coco you definetly have to feed with more than only CalMag as suggested by others before. Hope that helped 👊 Happy growing 🍀🖖

Yes. Also Coco is inert and has no Nutrients. Only watering and some Calmag won't get you far.

If you’re using distilled water, it’s important to add CalMag right from the start. At the stage your plants are currently in, I recommend adding 0.5 milliliters of CalMag from the brand Biobizz. If you’re using a different manufacturer, the dosage might vary accordingly.