Need help badly!!!!!!

Over the last two weeks my plants have begun to turn yellow. At first I thought it was a nitrogen defic. And tried to remedy it to no avail. Checked my ph and it was off the charts. There was some change with my tap water which used to be a almost perfect ph. It is now off the charts for whatever reason.
So, I began to flush with ph balanced water over the last week and it has done nothing. The ph dropped to 7 and held for a day or two and now is back up to eight.
I am using coco fiber/perilite as my medium. Which are both neutral. I am using botanacares fertilizer line, which I have used for the last almost 10 years. They are all supposed to be neutral too I believe.
Any help would be awesome. About to lose a crop.

Pictures would help. How old are the plants? are they in veg or flower? Sounds like your PH is to high and your getting some lock out.

agree with bam, sounds like nute lockout...using the medium you are, you should be able you flush it well, quite easily...use plain water, properly ph'ed, and have enough of it to rinse your medium 2 to 3 times over (3 gallon pot, 6-9 gallons of water), and hopefully your girlies will start to get better...best of luck!

The plants were in veg for a long time. Kind of kept them stunted due to circumstances. About three months. They have been in bud now for almost two weeks. They didn't start until theybwent into bud and started getting hit with nutes.
I didn't realize this whole time that I had to flush them that much. I'm going to give that a shot. I was only getting about a third run off the way I did it. Thanks for the help thus far.

also something that might help out, when you water, check off your runoff water ph, and it might let you know if you need to raise or lower the ph of your nutes when feeding...i use a hempy bucket, so i shoot for 5.8, let's say i ph my nutes to 5.8, but when i feed, my runoff is 7.4 or something, i might try droppin' the ph of my nutes down to 5.0 to even it out a little bit...

it sucks when you have problems with mj, cause even if you do successfully take care of your problems, it could take days or weeks to show visible signs...

also, how widespread is the yellowing?
is the yellowing more concentrated on the older growth, or new growth?

3 months in veg! awesome! sounds like they're some girthy girls! being large and having a well developed root system, and being in flower too, those girls can use up some energy, where you might even have a nute DEFICIENCY, a lack of nitrogen can cause some yellowing...but in flower, they don't use that much nitrogen, so hmmm...potassium def can cause yellowing too...pics would really help, i understand if you don't want to post em though, personally, i don't post pictures...at least fake myself into feeling a little safer that way...

you know what, the more i think about it, it really does sound like a deficiency, i went and reread your first post, and you mentioned your ph being sky high (how high?), which would lockout nutes, causing a def...maybe just doing a good flush will take of it all, i know salts and all that crap can build up over time, and raise ph and stuff...

try looking up pics of nute deficiencies and abundances, and you should be able to narrow it down to a good couple possibilities...after you've done that, check the ph on some runoff water to double-check if it's in the range that the plants can or can't absorb it, if you feel the need...
flushing and makin' sure your ph is straight should take care of it all though, imho!

I know it sucks but it's locked up prob. Try to flush with low ph water it will help I had it happen to me too my water is usually 6.5 ph and I checked it later and it's 7.5 had my plants lock up in week 6 agh. So I ran 6.0 ph water to flush and it didn't change much in my soil. So I ph 4.5 water flushed and got it down to 7.0 I put guano on top and kept my water ph to 6.0 to 5.5 and they turned out beautiful. You caught it early enough I think u will b ok Pics help

U will have to flower longer so if u have moms clone her again. If you don't and it's all or none try what I did. I had my last batch infested by mites after veggie for a month I tossed them recloned treAted everything and now I'm about to harvest a super healthy crop in 5 wks. Don't risk wasting time and money

Three months veg is a long time. The older the plant the more it's prone to issues. I stopped the long veg and pack in more plants that I fim and top a lot. Now I veg two weeks to a month. And grow 6-8 med sized plants per 600 watter instead of month and a half veg and 4 pp600. Way happier plants.

Same or more yield cept I get one extra crop a year now

Nice guys. Thanks for the responses. I'll do a flush and check for def. In anything. If I can get a pic or two up I will. I'll keep you all posted.

One more thing that could benefit you is supersoil it's so easy and the finished product is second to none. Just add water

Okay guys, I figured it out. After flushing I noticed the water smelled horrible. So I decided to transplant. When ingot them out of the pots I saw they were extremely root bound. I tried to take pics but the hps light kept screwing the pics up.
Transplanted with no negative affects and the plants are already doing better.
Thanks for the help guys!

glad to hear your girls are doing better!

I just had a similar problem and I foliar fed with extreme serene and micro blast, seemed to do the trick. Glad the girls are doing better