Jon...

Its hard to give advice without knowing your setup. We don't know what kind of lights your using, how far away they are, what nutes your using, if any, etc. I can tell you, my 8 day old seedlings, are bigger than yours and got their first taste of nutes last night. I won't post pics in here and jack your thread, but they're about 7-9" tall - I do have a few runts in my litter, but those are indicas that I'm vegging out like I did my bubblicious so they're super bushy for flower