ph level rising

My ph level keeps rising to 7.something. After adding ph-decrease (bought it at the petsmart) The ph satys at a lvl of 6.5 but with in hours it increases to 7.3 or even higher. i'll give you guys some info on that i use. Maybe it would help...

I use ( a green 5 gallon bucket which was spray painted black, air pump, air stone, 2 repi light 2.0 and a 5.0, for nutrients i use GH flora-grow,macro,bloom; oh and coco-dan CROUTONS as my fertilizer.)

i keep the room at a constant 82 degree
no humility meter. i also use a pool wate ph tester.

and and my white widow is peeking out of my wool/cotton like growing cube.(bought at a hydro store)
 
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