plant yellowing. please help

this plant is arjans strawberry haze 18 days into veg.
the soil is westlands john innes compsot no 1 with 30% perlite
ph is 6
fed 2 days ago with 1/3 strength mg
light 400w hps
transplanted 7 days ago and problem started, i also ahve two other plants from the same batch which have not been transplanted and they are fine
room temp is 82-84f
4 of the 6 transplanted plants are showing these symptoms

any help would be greatly appreciated
 

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