Blue light is spot on for 'veg'.. I can't see anything wrong with that!.. maybe the soil coukd be a little hot, you'd presoaked it before putting plants in hadnt ya?. Why not run some ph'd water thru n see if they pick up, they are the youngest plants aren't they?.. they shouldn't really need extra right now. otherwise give em a feed at a low strength!.. And are ya gonna top any of the other gurls?.. its about time to do it if you plan to!.. easy now!..