Please help

Hello everyone. I’m having some issues with my plants that are outdoors in SoCal. All the plants seem to be having light green leafs on top new growth when the lower fan leafs are darker green compared to them. The stems also have red/purple marks. The plants are all in happy frog soil, they have been vegging for about 4 weeks with supplemental lights over them for when the sun goes down. I’ve tried fertilizing and that doesn’t seem to change much but cause burnt tips on new growth, I’ve been using only water for the last week and that doesn’t change anything either. If anyone has any idea what this could be please share your ideas.
 

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