11 plants. 6 with yellowing leaves? lots of pics

Hey guys new here just started a journal https://www.rollitup.org/grow-journals/156240-11-plant-ebb-flow.html check it out.

Having some problems with half of the plants while the other half look perfect. They are only 3 inches tall should I be concerned about that also?

I started the seeds in the rockwool with 2.5ml of each Floragrow, Floramicro, and Florabloom so it probably is nute burn but I didnt start to notice it till after they had 2 nodes.

I'm seeing lots of new growth that all looks normal. Maybe I'm worried about nothing. Here are the latest pics of every plant except 2.

I'm Lost haha

Also forgot to say that the growth has been stunted on the plants with the yellowish/brown leaves.

Well I am fairly new so Im not positive but I would say nute burn. The salts and such in the nutes build up and you should probably flush your plants and I think they will be fine.