3 weeks old

they are in foxfarm soil no nutes, water is 6.5ph, im thinking it a Phosphorus Deficienies, but they are 3 weeks old so these small plants should not of used the nutes out of the soil already? what is my next step?

i see what you mean with the blue, usually a dead on indicator for phosphorus
but it doesn't seem too likely that those small plants sucked all the nutes out of those pots
you'd really think you have something funky going on with the water

I guess will let the soil dry out and put in bigger pots an water with 6.5 ph and hope it gos away. what eles can i do?

I'd honestly start adding some nutes. That is a P def.

Use your heads... the plant's don't necessarily need to actually suck all the P out of the soil in order to have a P def, just the P in the small amount of soil around the roots, and since weed is one of the fastest growing organisms in the world, it may have simply used up all the P the roots had available.

If you were also too careful not to overwater and always took care for the soil to get dry, that means that the lack of water did not allow the nutes in the soil to get fully dispersed in the soil, which would validate the above opinion.