Is my plants going to die!!!!!

I am using CNS grow nuts...and MagiCal in my water....i use what the bottle say use in the water...im using a drip system...they get water 4 times a day for 20 mins...here are some pics of what they look like...they just started looking like this over the last few days....what do i do...can anybody give me some type of ideal to fix my problem

a lot of times leaf tips curl under to stop water evap. It looks like you still have them in grodan cubes. those have no nutes and hold little water. More details on your set up would be helpful in helping you.