My very real nightmare!!!!!!!!!!!plant looking very sick!!!!help!!!

the babies are clones from amnesia mother.......
everything was fine until last week when they started to yellow,and then brown spot arived too.....the growth has stopped as well...smell gone.....
i think i was giving too much water,firstly,and later i discover that the water was way too alkaline .......my friend told me to put a drop of ph down every litre of water,but yesterday i test the water with the nuts and it was over 8........
the plant now receive only water with the proper ph(6) and a bit of stress reliever(canna rizotonic)....
i wanted to flush but my friend doesnt trust it.........so any advice is welcome!!!!!
thank everyone!!!!!

u might have Potassium deficiency https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html

Follot the link and scroll down to Potassium deficiency

your plants might be low in calcium and magnesium could run a little nute from that. also testing after you add the nutes doesnt cause by addin the bases and acids you are destroying the nutes.
what light schedual are you on cause that might also be interfering with root growth
what are you walls covered in and how hot is the room
another thing is how big are your pots because the roots might have out grown the pot.
and just remember that roots grow only when the dirt is dry beacue they have to grow to the water so makesure that your soil needs watering.
a good tip is to stick you pointer finger in the pot up to your 2nd knuckle and then if it feels dry and dirt like then its time to water if not you dont water it about 3-5 days sometimes depending on your strains

mmhhh i saw the pictures for potassium but it doesnt look that is the problem.......
i just think tomorrow i am going to flush them and then start again with proper ph water and nutrients.....
man thank you for the super quick reply..impressive

i am on 125 watts cfl 24/7