how acidic is too acidic for soil?

My run off is at 5.5 ,the plant looks awful tbh.But there is bud and it does look ok i'm about 3 weeks away i think,this is my first time ,ive just noticed a few red hairs here and there.I had an over fert problem so ive just been watering for the last 2 weeks or so.

Soil ph needs to be in the 6's closer to 7.0. Just a few red hairs, your probably more than 3 weeks out.

5.5 is a bit low for soil man i am noob my self but about 6.5 is what i aim for, the diference between 5.5 n 6.5 is ten times more and from what i av learned getting the ph round about right is inportant or the plant wont b able to uptake its feed at certain ph levels !!!!

as how to imrove the ph then ur looking for one of the regulars round ere to help out !! what is ur water ph before u water out of interest ? coz my ph run off is usualy similar to the ph level it goes in at !! if u rectify ya problem now ya girl will pick up it will av stunted its growth slightly but u can just flower for a bit longer till she fattens up real nice for ya,, for instance my last girl slowed a little then i fixed her up flowerdfor 2 extra weeks n bingo , shit loads of quality bud,, hang in there man !!!

my tap water is 7.3 ph.When i add the nutes to it ,it goes to 6.4 ,but for some reason my run off is 5.5 . I made a few mistkes this grow,i have the gear to keep tabs on all this h stuff from the start next time,i waited until there was a problem before i got the stuff.I also made the massive mistake of not adding perlite to my soil,it drains like old people fu+k .So flushing is pretty much out of the question.The water does drain out ,just takes forever.But live and learn.

Edit..thinking about getting a little dolomite lime to mix in with the next stuff i use...couldnt hurt could it ?

ps, there is no stunted growth the thing is 5 feet tall and i started 12/12 at 12 inches tall..the buds look pretty decent to ,getting really frosty and fat,just all the fan leaves are going to shit.

Use the lime, and that just sounds like nute burn if not stunted. Also, as many plants mature, their fan leaves will yellow and fall off.