Help: Black spots on leaves

Add CalMag as soon as possible. double dosage.

Looks like nitrogen deficiency starting to show. and the block dots I would not worry about unless you start seeing more. Doent look like anything alarming to me. But maybe hit you plants with some liquid kelp and top dress to fix you yellow leaves

https://420life.com/wp-content/uploads/2021/10/Marijuana-Leaf-Deficiency-Chart-scaled.jpg

Yellow leave on the bottom should be nitrogen deficiency. Black spots can be multiple stuff, hard to say at this early stage, could P, K or bad environmental condition. Try to feed at higher EC, if this doesn't work out, your compo organic fertilizer might not be the most suitable for your crop. With organic fertilizer it's also the problem, when you identify a deficiency and feed via roots, it will take till your microbes/bacteria made all the nutes available for your plant. So deficiencies can progress even if already fed. Foliar feeding is the most effective solution when having trouble during veg