Lost Coast OG.

Hey i got a Lost Coast OG (humbodlt seeds) bout 1 week into flowering an i got some probs with the leaves turning yellow on the bottom but at the top they are looking like they are getting burned. She is in MG seed started mix with some perlite have given it one watering with some sensi cal/mag an recently 1 feeding of dyna gro bloom the other day cause the yellowing leaves but shes not getting any better. what wrong with her??? also ph going in is 6.7 coming out its 6.5

well i flushed her with ph 6.7 water the what looked like nute burns stopped but the yellowing is gietting worse maybe she bounce back in next couple days