First, it's far too early to give them nutrients man. I am just about my done with my first grow, things have gone very smoothly, and I am very appreciative of that. If I can give one single piece of advice, it's go easy on the nutes, be conservative. So many newbies ruin their plants by nutrient burn, or by over-watering. Also, 4.5 feet is WAY too close to have the 1000 watt lamp to those babies. Move it up a shit load, if not, honestly, I would just keep em under the 100 watt for a while. Just to give you an idea, I got clones from a friend and they were about 6 inches tall, lots of true leaves, and I put the 1000 watt lamp six feet above them for a little while. Also, you are going to waste a ton of energy using a 1000 watt lamp on seedlings. Why not use some fluros for a week or so? Best of luck