Problem with my new grow box.

anyone tell me whats problem of my plants..? leaves tip started to turns yellow n less crystal i can see when it is flowering now.
i have change a new bigger grow box,but same set up as last one,is that not enough fresh air..? coz my last harvest was successe,dont know what happen on this?!
Temp is : 20-23 coz its winter time here, Humid is: 55%-60%,n i just put fertilizer last week,but it was same i did for my last grow.
anyone can help...????

Looks like maybe a little burn there.
What and how much did you feed?

thx for reply,..
im using 'fox farm' fertilizer,n im using the same issue as last time. it was no problem at all.
n i only seeing this when she's flowering now,early stage was fine too... weird!

maybe to much nitrogen ph off? if its a different strain may not be able to handle the nutes like your first.
i am a newbie so not sure good luck you will get it figured out.

^^^ looks like too much nitrogen. Those leaves are super green. Do you use full strength nutes. I would get some light green paint and just hide those signs