mrgreenfingerz

should be ok ive used 20-20-20 before. just build your feed up from 1/4 recommended dose to full over time. watch your leaf tips they will tell you if its to much they will burn at the ends slightly when you have reached max boost should be ok but do some reading id add it at second week of flower depending on how long your flowering time

thanks again m8, 400w digi dimmable ballast with hps all the way. coco compost, sog method with 8 5 ltr pots and maxicrop 5-5-5 nutes with canna boost for flowering. dont forget extraction. all this in a 1mx1mx2m tent. its a good producer for us personal growers

thanks bro, im gunna enjoy watching yours grow and hoping for the same results