1st grow. Please tell me im worrying about nothing

Anyone have any ideas. I can't seem to figure out what exactly this means. Is it possible to light bleach ur plants with an LED?

that slight discolouring is them just telling you it's time to start feeding em, start on 1/4 strength nutes though

they look good

Im worried that they are too small for 30 days in. Shouldn't they be bigger at this point. They are only about 7". That is 4 weeks of Veg and I know I have read that people already switch over to Flower. Im thinking they should be atleast a foot tall before I switch to flower. At this rate that would put me at another couple of weeks.

Some strains are just slow growers. Just veg them to the size you like.