Embarrassingly the following two plants are at 19 days from seed, currently got them under a 400w hps after switching from a 200cfl. why wont they grow !!!
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ok they are under a high pressure sodium bulb... so 2700k light? thats your first problem, get a white bulb, metal halide for veg, or go back to the 200w cfl. save the life span of the HPS bulb for flowering
next, thats a BIG ASS POT for a little ass plant!, so the roots must stretch and stretch to get nutrients, so yea its growing, just underneath the soil, not above it.
what are you feeding it? up the nitrogen a little i guess, and the micro nutes, but not much, again, thats a baby.