What is this? plant diff

[JokerJohn]

hey guys so this is on one of my sativas been on there for a while doesnt seem to be doing much damage now but we all know things can change fast. so i just wanted to know what im dealing with here?

thanks in advance guys!

 

[JokerJohn]

the new growth is all good but just wondering was i on the border for nute lock?

 

[gittergreen]

Need a little more info like what have you been feeding it? to even guess. Thats a good sign the new growth is healthy I can say that much.
I checked your grow out in your signature and LOOKS LIKE EVERYTHING IS HAPPY AND GREEN! KEEP IT UP!

 

[WizHigh]

looks like bleaching from the light

 

[Smokemupm8]

Or maybe the start of Potassium Def?? Not sure, what you think guys?? Also a good chance of bleaching i guess, but dont know how the setup is being run?
Also, its hard to tell, but maybe you need to transplant to another pot, and this way you can make up a good soil mix for her that should get her thru!! Sorry im not 100% mate, but its hard to pinpoint things sometimes without all info.. Hoping theyre all good! Smokemup...

 

[WizHigh]

That or lack of nitrogen.