Having an issue with discoloring tips just turning a lighter green.

I have 3 auto AKR's that are just entering the flower stage for about 4 days now. And the leafs started to turn a lighter green at the tips of the some of the leafs mostly closer to the top of the plant. Someone previous in my AKR grow thread in my link told me not to start to give them nutrients yet, but could it be time now? I seriously just want to double check on whats up here first time with autos...
Cheers!

That girls has been in the flower stage for a lot more than 4 days.

Not the greatest pic, but my guesses would be

Temperature fluctuation
PH Issues
Underfeeding.

Just needs food mate. If you were working out your muscles your body would hate you pretty bad for not giving it something to support the growth right ... ? I`d start your flower feeding schedule but supplement a bit of extra N. Organic coffee grinds will achieve this after they`ve been run through for a batch first, yumm. Otherwise you`re good mate, good to see another ON grower here as well, and Kush to boot !! Got mine in my sig

KC

KushCanuck said:

Just needs food mate. If you were working out your muscles your body would hate you pretty bad for not giving it something to support the growth right ... ? I`d start your flower feeding schedule but supplement a bit of extra N. Organic coffee grinds will achieve this after they`ve been run through for a batch first, yumm. Otherwise you`re good mate, good to see another ON grower here as well, and Kush to boot !! Got mine in my sig

KC

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I was thinking it just needed a light feeding. I'm using Bio Thrive grow nutrients, and I have worm castings inside the pots already will this do the trick? And they have been only flowering for that long its incredible how fast autos take off. Ph is also perfect and the temp stays at a steady 80-85. Going to start feeding tonight. Thanks for the second opinion I seem to be gathering the Ontario growers on my forums pretty sweet getting tips and advice from locals Cheers!

Afghankushgrower said:

Thanks for the second opinion I seem to be gathering the Ontario growers on my forums pretty sweet getting tips and advice from locals Cheers!

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That was a hope of mine, know their around, we just stay hidden, haha. Would be great to have a little gathering from in and around Southern Ontario, power in numbers rightÉ . Anyways, you should be good with the castings, will supply some of what you need but won`t last forever either. I`d be gentle with the feeding, never done autos, so not sure how they`ll respond, but I imagine it acts like other marijuana does,well with nutrition, haha

KC