Good fertilisation plan

Does anyone would have suggestions on a good fert. plan?

My baby's are about 36" high and are in pot of 11".Spotlight is mh 1000 on a 18/6 mood.

I don't want them to be harvested since i use them for clones only.I wish they had a lot of new branch for cloning.

I use Blue magic (A+B) at a +- 1000 ppm or 20-20-20.They have to be watered almost every 48 hours.

Should i fert every watering?
Does my choice of fert is ok?
Is there better choice?
Is there any good calendar existing already?

before you make a big mistake, no dont feed them evertime you water you burn them!