Need help diagnosing 2

[H4john]

Hey all. Was tending to my plants when i noticed this discoloration on some of the leaves. Any ideas as too what it could be?

 

[UrbZ]

It kinda looks like what my plants leaves going on. Can you wipe it off? If you can its mold. If not from the looks of the first pic it may just be a slight deficiancy to me.

 

[H4john]

Just tried, didnt come off though. Pretty sure it wasnt mold, my humidity has been on the low side due to the dry cold air. If it is a deficiency, what do you think id need to correct it?

 

[UrbZ]

I wouldn't do much. They look healthy. Maybe just a little more nutes next feed.

 

[H4john]

Kk thanks urbz. Im making the switch to 12 12 the 26th, so should i give a bit of gro and bloom or just bloom? I remeber reading somewere its not good to just stoo giving gro but rather to slowly add bloom. Not too sure of the validity of that though.

 

[UrbZ]

I do not know that for sure. I use a 3 part that is used throughout the stages. Someone else may be able to help with that.