yea i think that area will get crowded, but hey its exactyl double my space and i can fit about 6 potted plants that big in there, i have a 400w too and it works nice for the area but with the plants being veged bigger they might need some more side lighting, i would go with those 42w or 45w cfl bulbs, like 4 of em hangin around your setup would be good, but im sure itll be fine without them. ive never heard of 5 day 100% success rating even with using rooting formulas and phd water, your a lucky man! as soon as im done with these peat chips i think im going to build a bubble cloner.