White widow from ilgm

So it's now my second time growing autos. Had a great grow with the purple kush and now running a white widow. I'm using a cyko cocolite and my viparspectra 300w. This will be my last grow before I upgrade my light and possibly my tent. Unfortunately i seam to keep getting slow seads. Its sprouted approximately 8 days ago and is only about 30mm across with its second leaves only just shooting. My lights about 22 inches above the plant and I've been giving it a tiny bit of go green calmag. This time I've added abit of ph down but still very slow.