help with plants

This is my first grow, just used bag seed for now. The plants are 2 1/2 weeks old. I looked at the plant problem thread & i'm not quite sure what is wrong with them & I just wanna make sure before I mess something up. This is a CFL cabinet grow using perlite & vermiculite. The perlite is MiracleGro cuz it is the only kind I could find around here.

1st Plant



2nd Plant



3rd plant

this is the same problem i am having, this is my first grow and im 3 weeks into it and some of my plants are looking like that. i am clueless

does anyone have any idea? i am going to try to flush them and see what happens any other pointers? annnyyyy onneeee

looks like it could be over watered, its not heat stress bc it will turn up the leafs will. What is the temp and humidity in the box? are u using any nutes at all.

Plants actually look ok.. I know not the most pretty in the world but look fine to me.. miraclegro is notorious for providing too strong of nute concentration for young weed plants .. plus you can see how dark the lower leaves are and see how they kind of crisp and curl downward at the ends ; this is a sign of over-feeding (nute concentration a little too high) SO.. you can try flushing them .. just run about double the amount of fresh water through the soil the next time you normally water and it should rinse the soil so as to bring down the nute levels.. IF nute levels and PH are actually fine then probably just over watering.. water like every 4th or 5th day and make sure to completely drench all of the soil.. good luck