They look pretty good to have been your 1st ever!:thumbsup: I would think that the yellowing of the leaves while in veg,would be due to lack on nitrogen.What fert. are you using?Magnesium def. usually has purple in the stem of the larger fan leaves.It can be seen in the stems and stalk as well...Make sure you vent the hood! I see your temps are reaching 90 degrees,with flo's... Just something to think about,Dawg! Your gonna do fine as long as you keep that HPS high enough,so not to have them smoke themselves.....VENTILATION is key!