Brownish big blotchy spots on lower leaves and taco leaves.

all the other leaves/plants are fine, it's just this leaf and the top of this plant. i don't think it's a big problem, i was just wondering for the future on how to fix this.

looks like mag/cal def not bad but if not fixed can be

looks like you're doing a good job. Keep it up. you could spray them with epsom salt. Just mix a gallon of pure water up and add 1 tsp of espom salt to the mix and a drop of dish liquid. But I'll tell you until it gets worse I wouldn't worry. Spray them it won't hurt. But just stay the coarse your plants look wonderful. just my opinion good luck