Can someone help me identify the diffency

i am using

promix
PH-6.0-6.5
GH floranova grow (7-4-10)

this looks like a mg deffenicy i was wondering what other though thanks for the help all feedback would be great

what are the chances of having a nitrogen def. it would seem unlikly because i am feeding it on a regular basis.

Looks like you over did it on the nutes. id flush with ph'd water.