You say you took the pics during their lights out period... plants will pretty much always "hang" like that when the lights are out - but if they're hanging when the lights are on, I think your issue is watering - you're not giving these ladies enough water if they're only going through 1/4 gallon a day... You need to keep a coco grow wet all the time - so give them more water and see how they do.
Good luck!