dna lemon skunk: first grow

hi this is my first grow I started growing three lemon skunk DNA genetic seeds 2 and a half weeks ago I used Promix potting and seeding potting soil i have not yet fertilize the plants if anyone has any recommendations of what fertilizer I should get it would be appreciated. this is an outdoor grow I have been growing them on my windowsill for the start I think I might move them outside soon I have been taking them outside every once in a while when it is warm. my one plant has been growing great so far but the others seem to be growing a little slower and one of them is starting to turn yellow on the tips of the bottom First Fan leaves, also that plant looks alittle pale and has stunted growth on one side, can someone help me diagnose the problem with this plant?
 
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