When you say it's stunted, is this because of slow growth...or is there something else that makes you think so? It was kind of difficult to tell from looking at your picture, but what I saw didn't look out of the ordinary. How long has that sprout been growing?

I like to keep my seedlings under fluorescents for the first week or two, before throwing them under the MH. The only reason being, when I start using HIDs I get fans going all over the place to circulate air...and I don't want to have too much air rushing around my delicate seedlings. And Weedhound is right about the light and nutes: Get your light as close to your plants as possible without burning them, and don't start feeding it any fertilizers until the third or fourth week.

Good luck with your grow!