Kings Kush and White Widow One Month Old Today.AVI

Ok so my babies are a month old today. I have ask a few fellow growers about an issue im having but haven't heard back from any one yet. So can anyone tell me whats going on with my white widow plant in the middle that i zoom in on. The leaves are light green on the edges. It's not nutrient burn because i haven't used any yet ,all three are in the same soil and it's only on one plant. The BC nutrients in vid are what im about to use maybe this will help and yes im going to use the grow formula.