I do not think he needs to use a single additive. It is the best fertilizer ever. That just lets me take it to even further levels. Just have him back off the calcium nitrate when in mid and late bloom. Say, 2-4 grams per five gallons, instead of the 12 grams. I am doing DWC on this grow. Look up my white walker kush grow. That is a coco grow. The MHP will give you some delicious and smooth smoke. That is nice of you to look out for your over ambitious friend.