My little grow room 4 og Kush automatics at 5.5 week and 3 baby Jack herer having trouble with the og Kush leaves yellowing

[JLC]

My room with 4 og Kush automatics and 3 baby Jack herer grown under 400 hps and using biogreen nutrients on two of the og the leaves are yellowing at the edges humidity is at 47 and temperature is at 25 degrees plenty of airflow and co2 bag

 

[mysticepipedon]

Kind of looking like an Mg deficiency or lockout.