Nitrogen deficiency? Overwatering? What am I doing wrong? Help!!!

[Strauss]

I just transplanted my babies that were looking great from solo cups to larger containers on June 19th and all of a sudden the leaves are showing burn on tips and edges. This is twice that this happened to me this year and I had to trash my previous grow. I have been growing for a few years and have never run into this problem before. Same set up as previous years, I am neurotic about humidity and temperature, light strength and height are fine (Viparspectra v450 led), and always PH my water. If I had hair I would be pulling it out. I really don't want this to go too far and have to trash this grow as well. Any suggestions would be helpful. Thanks!

 

[OldManGrower]

How are you checking your PH? This does look like a PH issue but may also be underwatering. Also add some Cal-Mag to your regimen. Are you using any nutrients?. I had a similar issue this grow and it was underwatering.