Its droopy, but healthy?

hey guys i grow in a closet with a 5 gal reservoir and a 400w hps i change weekly im using 1/2 str nutes still and i have this one plant that looks good but it appears that the leaves are so heavy its weighing down the plant not crooked or anything just big droopy leaves is there anything i can do to help my stem and branches harden up a bit without pre-flowering to help it "perk up"???

your plant looks good. the leaves droop when they go to sleep just before bedtime. make sure your lighting is consistent in terms of hours per day. if your buds droop get ascreen like i got

what's with your ventilation system?? you need a cooler that gives air, straight to the stem.. sorry for my english..

I figured out what it was. I didnt top off my system on the last day before the reservoir change. The nutes were probably a little too strong. So i cleaned it out thoroughly with bleach and water. It rained last night so i collected some rain water, then added a couple drops of h202 and it perked right back up.