First grow may have messed up with my choice of soil. Help!

I purchased the soil I show in the picture. At the time I didn't realize time released nutrients could be bad... Should I repot with different soil? I am growing 3 feminized strains. Fucking Incredible, Super silver haze, and white widow. Florescent light set up. Seem to have a calcium, magnesium deficiency, but only on the widow plants. But now I am thinking maybe chemical burn from the soil?

Ohhhhhhhhhhhhhhhhhh Lord................HOME DEPOT??? Firefox Farms is what you need............Home Depot sells DIRT

I will definatly Ph the water and hope for the best! The affected leaves on the 2 widows (the only 2 plants showing signs of bad health) there are about 2 leaves on each plant that are yellowing slightly and small brown dots which when I looked up looked like magnesium deficiency. Should I trim the damaged leaves? Is there any reason the white widow would be affected and not the other 2 strains?

just get some spsome salt and water them bitches. fuck the PH too, I never PH in soil. that soil should be fine, I wouldnt worry bout it. if its yellowing you need nitrogen too. Dont cut anything. Differant strains will want differant amounts of food, its normal. try not to worry about shit to much like alot if ppl do on here. get some big ass lights to while your at it.

same with the nutes too. I use cheep ass gro fine like $3 for a bag n the only problems I have had is magnesium def but epsom salt takes care of that. feed them when the plant tells you, look at them with lust when you feel impatient and let that shit grow.

Thanks for the help MO841! I am not too worried about how much i get from these plants as I plan to clone and keep the cycle going. I am not worried about yield because I am only growing so I can stop feeling like a criminal trying to find marijuana to curb my anxiety panic attacks.

just feed them, and check the ppm run off...if its higher than ur initial feed, come down on the nutes...and keep paying attention to that...I agree...some people just make the simplest things into rocket science...