fan leaf curl/cup down flowering. ideas?

Random bagseed
Soil scotts
temp 60-70
cfl 18x23w
...10 on top
...8 on sides
started seed nov 6.
flipped to 12-12 jan 6.
pistils showing jan 20.
repotted bigger container
water once week with tap letting sit opened for 24-48 hours
small fan blowing at light. just started let run 24-7

Started with 3.
2 were males and tossed.
this one is going very slow

Overwater?
Moisure stress?
phos deficient?
N tox?

I noticed some small leaves have like dark blotches on them, about 4 of them.
stems have been purple since beginning

maybe ph issue?

venting issues? that would be my guess. how high is your temps but also do you have a fan oscillating with good fresh air
. is the fan to blow on the plants, oscillating if you can if not indirect air.

venting issues is what im thinking. theres one small fan. it does not oscillate. it blows straight to top of plant into lights.

if overwatered, all leaves would droop, correct? i repotted when pistils popped because growth slowed down and figured it would help flowering. I highly doubt rootbound

temp stays constant around 65. never below 60 and never above 70

purple on stems( doesnt matter if its a purple strain ) is the beggining signs of Mag def. you see the center of the leaf before it veins out ,see its purple thats another sign after the stems then it starts to grow up into the veins of the leaf then you start getting blotches of dark or brown colored spots on the leaves, its Mag def. get some epson salts prefferably non fragrance at 1 tbls per gal , dillute in hot water first(half gallon) then add cold water to bring water to room temp , Feed problem fixed!

That is a temp fix and seeing your already half way into flower just keep adding a lil bit at like half tsp per gal untill you flush , next time add some Mag into your grow or like me i add it into my soil so i dont have to worry about it

the purple has gotten worse over time. i know for the most part that purple is a def sign. there are a couple little leaves ive noticed with blotches.

yeah its mag def. reason it got worse is cuz it wasnt corrected thats why its all thru the viens and theres blotches , just feed epson salt as directed , other than that your plant looks fine

well epson salt is a mag sulfate so has soon has your plant absorbs it ,should balance itself out make sure your ph is in range too, to prevent any lock out...how long did you veg and what size pot is that?

ill give it a try and get back in couple days. thanks dude

yup no prob , the reason i asked how long you veg and pot size is cuz , your upper leaves have a slight curl at the tips to me it looks like root bound , if there enough root space and its not root bound then its just a lil nute burn .wich is fine when my leaves curl or tips turn yellow a bit i dont mind at all i just know not to be pushing em to hard for the next feed

my first thought was rootbound. vegged for like 2 months. i noticed slow growth and droopy leaves so figured id check the roots. They were crammed so i repotted into a 3gallon container. leaves still drooping though.

you shouldnt veg in 1 gal more than 2 weeks Imo , and 3 gallon is BARELY enough room for a 2 mth old plant not including flower time,also if you have a big plant in a small container you start having Ph problems wich causes lock out, its too late to switch now , but for future refrence make sure you have enough root space . for example what i would have done is 2 weeks in 1 gal , then switch to 7(you could do 5 gal) for the remaining 6 weeks then flower,

My lil rule of thumb not 100% accurate but a general idea, for every week you veg you need a gallon so for 4 week veg 4-5 gal or 8 week veg 7-10 gal. just a more or less understanding of how much root space you need

Too bad you werent aware of this , by not letting your plant root out like it did you really skimped your yield and vegged that long for nothing, live and learn now you know for next time remember More roots you have more flowers are the result