Burn/yellow tips of leaves

Hi guys,
Seeking advice on these little ones. They have got some burnt/yellow tips of leaves and some dried out bottom leaves. I am running them on Ionic Bloom Nutrients in a Wilma drip feeder under 125 cfl.
What do You think is the problem?
Thanks for all Your help! Here are the photos:

We need alot more info to better help you. what is your grow set up. what is your ph, ppm, and anything else u can think of and then we can give u more accurate answer. If it is your ph the nuts may be there so dont want to tell u it needs something if we just have to fix something simple like that

Whats the NPK ratio on your nutrients? Also, how much are you giving them? we need to know these things..