First Run In New Growbox F1 Hybrid Automatic

First feeding approximately 12 hours after germination. Initially I learned not to fertilize a few days after germination so the plant grows roots faster because they're looking for minerals and stuff. That was with regular plants like tomatoes. On the package of the t.a it says to fertilize right at the start and I think I want to nourish the plants right away. "Tinytenter" a user on this site, said the coco will absorb a lot of calcium and or magnesium. So Cal mag is a must instantly after germination. The roots will probably get going quickly anyway in my airy, hydroponic simulating substrate, so it should be good to put some nutrients in right away. Btw that's what we're doing here, simulating hydroponics by using a very light and airy substrate, water will drain fast and roots will grow quickly also. There is zero fertilization beforehand, every single milligram is added manually. Because of the good drainage it's important to water the plants at least once per day, maybe more. We will see. First time analyzing and controlling TDS btw. Unfortunately I have no way of controlling the substrate, any thoughts about that? Water is at 1.2 EC after adding all the fertilizers, I was at 0.8 ms/cm after adding Cal mag but didn't know yet that the other fertilizers will add to that. Gonna leave it like that until the 10 L canister is empty. Might be good to saturate the substrate a few days and then giving a little less. We will see ;) Shout-out to tinytenter, I came here through him from YouTube and my Growbox and first grow ist heavily inspired by him! Edit Day 4: Today I had my first little bit of run off water. This means for me I'm watering enough and the substrate is saturated. I'll be careful not to overfeed now, I don't want the hassle of removing water from the pot saucer. I don't mind a little bit of run off every day but not much.