must have posted in wrong fourm need help with bubbler

heres what im workin with : air cooled 400 hps. subjects are in second week of flower. temps are air temp75/res temp 71. 18 gal rubbermaid tote 10 in x 10 in net pot . this poses my first question. air pump is rated for 20 gal fish tank . also have 2 gang splitter with 6 in air stones. will that provide sufficent o2 at root zone???? now on to p.h. and ppm. p.h. currently at 6.1 right now i dont access to usual methods of p.h. control basically i need to know what substances (no access to hydro store) i can use to control p.h. in my bubbler. ppm 640 just receved p.h. & ppm meters. seeds left over from previous grow. strain unknown,but the bud was dank plenty of trichromes. need to act quick any and all opionions are appreciated. also had to "pop" main stem 3 days ago . wanted to use space more efficently. day 8 flower

Looking good and your PH is not too bad. You can go 5.2 to 6.2 and be good. There are 3 different acids to bring it down. Most comon is I think sulfurric acid, yes battery acid from auto store. Watch it it's strong a little goes a long way. Quick is lemon juice concintrate. I like to stay about 5.8 PH.
Temps are great , keep them there. Meters are the shit man.
Slowly bring you ppm's up. I can gat mine over 1000 but if the tips of the leaves start to burn cut back some.
Air is good. You got it tuned pretty damn good. Keep the pic's coming. I like to see success. Should be a good yeild.

thanks bro next time ill be better prepaired. definitley scroggin my next lidies

also added 2 2100k compact fluros,&3 4100k. no yellowing

looking nice :thumbsup:
Like loc said, slowly bring up the ppm's.
I went up to 1600 last time, but am staying at 1200 now and I'm 5 weeks in with no probs.
Keep track of the results of sliding ppm's.
My skunk can handle the big doses, but my widow seems to like the lower ppm's.

im gonna top off with 1 gallon at 800 . put half in check yhen add other half

any suggestions. will be raising rez ppm to 775 in few days

changed rez , ppm 750, ph 5.82,rez temp between 67-70 deg. cel.

wow beautiful system need to stick to your day job stop tring to be mr. electric haha

rez temp in "c"? you want 68-72 "f". Just checking