Discoloration in leaves first grow

right now this is my first grow i found out on my test plants pictured above that ocean forest is bad for younger plants and autos. they call it a “hot” soil. try using happy frog soil by fox farms that’s what I’m using. that and roots organic soil. and if its a magnesium deficiency … get some cal mag. it works pretty good. it fixed one of my plants when it was looking like that. also what day are you on? or week. do you know what kinda plants you’re growing or are thy bag seed?