You can, but you can also feed it half dose for the first couple of weeks. I use FFOF and another product very similar, if not hotter than FFOF, and feed starting at day 3 above soil. I give them 1g of MC/4L of water. You'll get good plants waiting a month before feeding it, or you'll get gooder plants by feeding early.I have always had good results with the Ocean Forest for about 4 weeks, wouldn't it be better to let it go at least until then?.