As is always suggested, every grow is a little different. My first ever I gave them Miracle Grow 15-30-15 on the 8th day of their lives because I didn't know any better. Then after 13 days of veg I sprinkled a bunch of nice stinky blood meal all over the top of the soil and mixed it in a little on the surface. Then watered it to give them a good shot of nitrogen. Had a little problem with some bottom leaves starting to yellow in the next few days so added some epsom salts to the water. Also foliar fed them with epsom, water and some dish soap. Stopped the yellowing and the leaves continued to live and they were on their way out to so it for sure did the job. Then flushed it because I started to read a lot about all this stuff and that's what it said to do because it probably had too much N. Plants grew like you couldn't believe with just a few fuorescents. Also foliar fed with some 12-6-8 MG and MG with their regular watering too which they really liked. Grew way faster than now when I'm doing everything "by the book" with even more light. Might throw the book away.