Hi Riu,i've grown in ebb & flood a few times,and i've had very good results,but i alway's use clones..Well this time i had to start from seed in rockwool..My seedlings are 2wks old and i want to put them in the e&f system..well for the first time,im using the botanicare line and r/o water,i want to give them 1/4 strenght of pure blend pro grow at first and,work my way up...My question is,should i give them,1/4 of calmag too? Thanx for the advice.