Sagging fan leaves, purple stems??

This plant has been doing alright until about a week ago i noticed it looked like it was turning a darker green. It looks healthy still, but with a slight sag. I have read that purple stems is a sign of a P K problem. I thought i might have over water this one, but after letting the soil get really dry over the past week, haven't really noticed it change at all.

This isn't a great pic, but all i have right now, i'll get better ones tomorrow. Still in veg stage, smells really skunky tho, more-so than the rest of the plants.
Whats the problem RIU?

whats the temperature and is it direct sunlight hours?

Stems turn purple sometimes and it is usually just a natural process that happends and your plans look great so i personally don't think you have anything to worry about bro!!!

My experience with purple stems was temperature related. Maybe it's getting too chilly at night.

Purple is either because it's too cold [not REALLY a problem to be honest, as long as it's aint TOO cold otherwise it'll stunt the plant] OR genetic. But that doesnt look like a purple strain to me.

The drooping, if not from overwatering is probably from too much heat during the day. [and if you got cold temps at night, hot during the day, the major transistion wont be doing your plants much goooood.]

If it's outside it's out of your control... let mother nature do her thing.

things look good.

have you given any feed to that plant , it may be a slight nitrogen deficiency ,the picture looks healthy,,,if there is no yellowing on the lower fan leaves just keep doing what your doing looks fine

Yeah i have been feeding it Botanicare Pro Bloom and Botanicare Sweet. This isn't a big problem, just me bein a lil obsessive. All the leaves are pretty healthy even the lower ones. I have been havin some medium temp. changes. highs in the 90's and lows in the 60's-70's for the most part.

i just started having the same problem but its pretty bad. im thinkin its heat cause im letting the first inch dry up before i water. i just started my 2nd week of flowering. day 8 if its helps. and ive been getting up to late and havent been moving the thin sheet i have covering it and it just amps up the heat when its down. i have fresh air blowing in but its just not enough with the sheet down. i have 5 1.5ft plants in the top half of my plants. and 6 in the lower half which are 3 clones and 3 seedlings. i have made it to where the sheet makes it completely dark for the 12 hours of darkness needed. my closet is 4 ft by 4.5 ft. my plants have plenty of room to grow. 4 females and 1 male up top and im not cutting the male so i can partially pollinate another indica dominate female. possibly a nitrogen problem? i just switched from miracle grow plant food to super bloom which is 12-55-6

nothing wrong with that plant, no nitrogen deficiency visible

i say strain relaited mine do the same after about the second week of veg