yes pics are a must...

are you soil or hydro?
if you put your hand where the uppermost leaves are, closest to the light... is it hot..???

how old are our plants?

sorry about the pain.. we will get to the bottom of this... sounds like to much fert to me...

in the mean time,

you should increase airflow between the tops of your plants and the light....

you should water with distilled water, if you are growing hydro.. you need to flush ASAP!!!

: )
i love you