plants droop before lights go out

hey guys and gals got a problem and cant seem to fix it im growing in coco using ionic im in veg my runoff ph is 6 when ifeed them its 6.5 they are about 2 to 2 and a half foot in size a little scrawny for my liking picks on my profile, anyway just before lights out say at 16 or so hours the fan leaves near and around the top seem to droop im letting them dry on top before refeeding so its not water logged down ther roots are white nd healthy and lots of them just cant get my head round it this isnt my first time but is sure my first problemo.grrrr. any input well apreciated guys a lost geordie

A bit of droop at the end of the day is normal but I have noticed that mine are more prone to evening droop when they are becoming rootbound, but I'm growing in soil. Coco can tolerate a lot more root-binding and those pots look like a decent size, so it's unlikely that's the problem. Maybe they need more water, coco is hard to over-water anyway.

Have a look on youtube at some of those time-lapse videos of growing, plants do often droop towards the end of the day and I don't think it means much more than they are "tired" from the day's hard work in the sun. Here is good demonstration of that: YouTube - Cannabis Time Lapse - Marijuana Grow #2

thanks buddy thats what mine are doing thanks for the link you are a hero made me feel a little more at ease must be the girls saying there tired mite change hours to 16/8 what u think

I'm still new to all this so I am not completely clued up to all the tricks just yet but I am not sure I would tinker with their light schedule until you are ready to 12/12.

Check your plants one hour before lights out.
If droop is observed, water them.
Does droop go away?

Also, are you using a nute made SPECIFICALLY for coco, or are you running calmag?

im using feed for coco use used it b4 havent trid to give them a drink b4 lights out ill try and let u know post back 2mor think im gona flowa the dam things