Yellowing leafs

Si este problema se da en la semana 4 es por qué a tu planta le falta comida. Sube tu ec entre 1.8 y 2.0. Suerte

Hello grower your plant look hungry your EC is too low and your Hymidity is too high I will say give them more food and make your EC 1.7-2.0 also make your humidity 45-50% enjoy 😎

If what you're writing in your diary is correct I think it's a lack of nutrients. If I were you I would follow the recommended amounts on the Biobizz bottles. With regards to calmag, I'm sure you are not putting in that amount but be careful with it because even a small amount extra can lead to a nutrient lock out. If I were you, from here, I would up the amount of nutrients according to the amount instructed on the bottle and stop the calmag. If this doesn't help, you might need a quick flush from that calmag but let's not jump to conclusions yet. Good luck with the rest of your grow, You can bring it back and get good product.

I think all your problems stem from the huge amount of calmag you are using causing nutrient lockout.