First time grow, Having a few problems pics included

Now nobody get mad but i searched the site probably a 150 times having trouble finding a solution. Stems are turning purple which i read is phosphorus def but i also have lower leaves turning brown at tips followed by turning yellow. Im using mg organic choice soil, the plants range from 1 to 1 1/2 month old and i topped four of them. Any constructive advice is greatly appreciated.

Also a scary thought i checked the pH today and its up to 7.4. I plan on fixing it tomorrow

The ph is what caused the leaves and the purple stem is probably because of the strain I hope this helps

acexxacer said:

The ph is what caused the leaves and the purple stem is probably because of the strain I hope this helps

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I thought that was why the stem was that color but my buddy is a dipshit and said he read that it was bad. Also im messing with the pH today i hope it works, thanks.

camo said:

I thought that was why the stem was that color but my buddy is a dipshit and said he read that it was bad. Also im messing with the pH today i hope it works, thanks.

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Changed my Ph but it still is continuing to get worse any ideas?

I wasnt using nutes because the soil supposedly is suppose to feed up to three months. But since it seemed to be getting worse i ran to the store and picked up some MG. Not what i prefer but all i could find at that hour.