please help... momma is yellowing??

ashort

Member
hello, my mother plant has started yellowing on the bottom leaves. tips are almost burnt like. someone help pls!

strawberry cough clone
24 hr light 250w hps & a few flouro tubes
5gal. DWC
supernatural grow aqua, vitamin b, supernatural green + stay
res is changed weekly
closet setup
temp stays between 72-77deg
ph between 5-6

..... everything is very routine, not sure what i've got goin on here? any help is appreciated!:confused:
 

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