Yellow tips please help

Mishari

Member
So I noticed 2 of my 4 plants are getting yellow tips in about 20 leaves of each I'm very new to the growing community but i think it’s nitrogen toxicity i gave them 30-10-10 and the ppm of the water is 800 and the runout is 1000 in there 5th week and the ph of soil is 7 it’s peat moss and perlite any ideas what to do?
 

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