Hi Goldie,
you may be giving that seedling a little too harsh light for its age. You mentioned that you use a 400W MH lamp; a CFL bulb would be more appropriate (and a lot cheaper to run) at this stage. I grow large mother plants in coco under a 400 MH.
As for seeds, BCseeds is very stealthy, you send them cash, they don't rip you off and they send the seeds in an unmarked envelope to the drop address of your choosing. Just a thought. Good luck.