First grow!!!leaf problems! Help before to late!

I currently have 4 plants growing. They are all good except this one. I replanted it in a bigger pot but it was having a bit of leaf trouble before i did it. It is in direct view of my full spectrum light. I'm not sure what is causing the problem. Please help me so i can fix it fast! It seems very dry in these brownish tips and spots. Almost if the parts could break off. Also tell me how i'm doing on my other plant, It would be greatly appreciated! There are pictures of only 2 of the plants. The 2 pics to the left are of the good plant. and 2 to the right are of leaf trouble.

they look a bit stretched a couple of em. what kind of light are u using and how far is it from your plants?

I'm using a fullspectrum 6500k 27w light.

I need help with this problem. It's getting a bit worse. Anyone know what i can do with this problem?