What is happening to my young plants???

Hi is it somebody to help me I am new here and like to know what happened to my plants. I am doing hydroponics, my plants are in 3rd week and food level is 12 what is quite low and my plant have got burned tips on new grow leaves so can not be overfertilazition what else it could be? They are starting be a pale on sides and dark in a midle.

Desprot for help as I have been trying for longer and same problem again...

Sounds like my problem, but different grow method. Check out the thread posted as"Please Help!".

picsssss????......

What is your pH?

I have got some pictures in my gallery check it out pleeeeeeeeeeeeeeeeeeeease. I do not know wha to do. I am dying for advice as my boyfriend is groving it and I get all abuse then, it is all my fault, lol....ph is 5.8 in the moment, many thanks for replies

I dont think the PH is a big factor at the moment. Umm also I am no expert at hydro but it look a little like nute burn but not at the same time,