help on a plant please

i have a monster plant in hydro
its about 8 ft tall
it was all fine with the exception of today
i looked at it and all the fan leaves are very droopy like their dying
usually i have to pour at least a gallon a day in the five gallon bucket cause the plant soaked up that much but the last two days it hasnt sucked up anything the water level has been the same
does anyone know whats going on with this plant?

any help would be great

check the ph of your water runoff, sounds like its locked out or something

root rot? have you checked the roots? i doubt it could be root bound in a 5 gal tub but have you checked? root bound causes your symptoms, they say allow 1 gallon per foot of plant, so yours are 8 ft in 5 gal worth a try.

i flushed it with distilled water two days ago and theres nothing i think im just gonna dump it
it was vegging for 3 months under two 60w cfl dual spectrums only cause i was having work done in my basement which took a lil longer than i thought so i put it in the flower room at 4ft tall
then it wouldnt start budding till week 6 of flowering but got huge almost 8ft tall
then the buds started coming in slowly then in week nine DEAD
its a 100 percent sativa and says 120 days flowering so i dont know what happened
people are saying i vegged it to long