Leaf curl - new environment?

What is wrong when the end tips of the leaves curl under?

I'm having way more issues than I've ever had before...

I have a 600W HPS over 12 plants sitting in a 20 gallon ebb&flow setup. I just moved to way North in the U.S. from way South in the U.S. I don't know if this could effect anything, but I've never had these problems before where I used to live. My plants are roughly 3 weeks old... Anyone have any input as to why my leaves are doing this?

Buuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuump.... Help is appreciated, I have some rep to give.

Leaf curl is a cooling issue.

From what I found during my own research, cause no one was responding... That isn't correct. For anyone who may be having this same problem check out the link.

https://www.rollitup.org/view.php?pg=faq&cmd=article&id=172

You said curling leaf tips not fucked up plants.

Read the title of the article in the link... Self explanatory. I'm tired of everyone trying to be so fucking egotistical on here.

Yeah, so what? The title says leaf curl; I say leaf curl. What kind of new information is to be gleaned from rereading the title? WTF does potassium have to do with anything?

Would have to see pics, Could be other reasons too