newby first grow with issues, please help!

hey guys what;s up...this is my first grow and I'm having some problems. i'm using the ebb and flow process with grodan rock wool cubes. my babies are about 2 months old and 16-20 inches tall. i've had them on a 24 hour cycle for approx. 1 month and have now been turning them down for 6 hours per day for the last week. the leaves started turning yellow 2 weeks ago. sporadic leaves have brown spots and eventually dry up and die. I use canna products, Aqua Vega A and B, and also Rhizotonic for nutrients and was told my issue is probably nitrogen deficiency So I added nutrients last week after I cleaned and rinsed the plants with plain water and now the issue seems to be getting worse. I am also on a 6 hour watering cycle. ph is between 6.8 and 7.2. acidity is between 80 and 120. and there is a 20 degree temp change at night. see attached pics. any suggestions or advice is appreciated...please help

i dont grow in hydro,but i belive hydro is suposed to be much lower like 6.2 ph,,i think that might be yr problem,when u have a ph problem it can lock out other things and make it look like a deficiancy

floydfanx6 said:

i dont grow in hydro,but i belive hydro is suposed to be much lower like 6.2 ph,,i think that might be yr problem,when u have a ph problem it can lock out other things and make it look like a deficiancy

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how do i get my ph down ? this is my first one im still trying to get the process down. any info will help.

what strength nutes r u feeding them??,so u check yr ph,but u dont change it? bro u need a ph of 5.4-6.2 in hydro,,,this is for sure what ur problem is,,,u can buy a ph down online ebay,,a hydro store,,ect...its pretty easy,,and u have somethign to check yr ph already obviously since u knew the ph,,also what are your canopy tempatures,20deg night time is a little too low,,youd like 10-12 deg if u could but its not the worst

no, i check my ph regularly but i didnt know ideal was between 5.8 and 6.2 i was ideally ranging between 6.8 and 7.8 it was flucktuating for like a week before i flushed the system then it went down to about 6.7- 6.8. what do i do ?

check it everyday,the rez,and add ph down to maintain it that way u can buy it in a hydro store,,or ebay amazon ect..

5.8ph
yeah check it in the morning and at night
ph up and down are cheap
make sure your ph tester is right

yeah dude yr ph is whats causing yr issues,,make sure to correct this and get them healthy before flowering imo,or u wont be happy with the product

i added ph down to my rezi so ill let you know how it goes when i check it tonight . thanks bro.

its not the temp difference ive growing in a 20 degree change just fine....the colder air at the end of flowering inducesee more tticgs anyways

yr gonna have to check and maintain that ph everyday bro,,,every single say,,,some pepel do it 2x a day,u got sick plants u might want to do it

floydfanx6 said:

yr gonna have to check and maintain that ph everyday bro,,,every single say,,,some pepel do it 2x a day,u got sick plants u might want to do it

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I just switched from soil-less to DWC. Its incredible how fast the pH will change on you. I have to adjust it everyday. Checking every twelve hours is the way to go for sure.

i dont think its the temp change either , its a ph problem im almost positive, my temps are are 70- 75 during the day and it only drops to 55 -50 . .

like i said, from the begining,,thats its a ph issue,,,read my quote did u solve yr problem get some ph down and up?