Lookin' like some healthy greens!! Sorry for the late response, Sabre. Haven't read up on hydro in a while, but yes, I believe you'd ad it every res change. Since you got some CalMag, molasses won't be necessary for the ca issue anymore, but it helps with trickle production, too, so... Not sure how to apply it with hydro, so you might wanna ask in the 'dro section