New Grower My first grow and the products i'm using!

[mrrager420]

Day 37 HELP!!!

I am not for sure why but my leaves are yellowing from the bottom up at a rapid pace. The PH tester i bought tested 7.5 so that could be the main reason. I've tried lemon juice and it "seemed" to have worked for a bit but i don't want to over water them either. Anyone know what the next best thing would be? Didn't think i'd have a PH problem with those tabs but obviously that's not the case. Here a a few pictures of them:

Blue Mystic Auto
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Gnomo Auto
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[Guerrilla]

hey man, looking good! those pc micros are hard to keep cool! if i was gonna do a pc grow i would get a kessil h350 magenta! run alot cooler than the cfl! when those cfls get closed up they get hot. i just switched out 420 watts of the big u shape cfls and it was a pain in the ass keeping them cool! led time now!

what day i the blue mystic? 37? those pistols look real good bro! hey man go to walmart and get great value spring water gallons it will help you lower it down cause it has a ph of 6.2! should bring you down to the 6.8 range!