Drooping plant

Hey guys, u geeza's have given me some great advice, id just like to say cheers firstly. Now down to buisness :P other day my plants were sticking out like mother bitches, looking very nice, gave them some water cos they needed watering (wuth nutes). Next day they looked nice, just looked alittle heaver cos of the water. Today they were drooping like there were alseep, pritty sure its not water cos there was a day between watering and drooping. andhow the soil was dry today (same day as drooping) so i gave them some water (not alot just incase it was the water).
any ideas why??, i was hoping the water would perck them up abit

my understanding is that:
you gots droopy plants and you watered them.
if they perked up within an hour it was a lack of water problem

If they didn't perkup (quickly) then you've got some other problem and watering probaly wasn't a good idea

Is the temperature good?

I had a similar problem. What water do you use? tapwater? Check the pH of your water, cannabis plants dont like water above 7.5, tapwater is usually a little higher than that....here at least. Your water should ideally have a pH of between 6-7, less for Hydro setups. Spend $10 on a pH test kit.... its worth every penny! Good luck