Leaf tips curling down...??

Im 3 weeks and 5 days into my grow from the time i planted the seed. I used 12 100w equivalent CFL's and a 250w HPS for veg, now im using only the HPS. I've been flowering for almost a week now. I was wondering why the leaf tips are curling downward? Its happening on 2 of the 4 plants i have on the top leaves. I recently changed the nutrients for flowering and are at about 900ppm. Any suggestions? THANKS

are you serious no one??

top three in my opinion:
heat
overfert
abnormal ph

it must be heat because 900 ppm isn't too strong and you better be smart enough to check your ph all the time

yep heat or just the change in nutrients did you flush before you started to flower

well

its over feeding them lol

your plants are really really small..especially coming off of veg like a week before giving them 900ppms, thats a big drastic change man

My plant is probably like 3 times the size of yours and i burned mine with 1000ppms after 2 weeks

I started with 310, low because i was switching from veg, then 4 days later 700, then 5 days later 900 like you and 5 days later 1000

That started happening, then came Mg Def. from my PH dropping too low because Flowering Nutrients LOWER your PH!

Not many people know that, and once your pH is too low (under 6.0 in soil) you get Mg deficiencies, curling leaves and what not

flush and pH your water after adding your ferts

and yo for real man that is a really really big dose for small plants like that ESPECIALLY if you are switching their nutes for the first time

thats crazy talk bro

same shit here man but out of the aerogarden- 7 im like wtf and now some of the leafs are yellowing on my indica but sativia is good