New Grower help !!yellowing leaves one plant at 8 weeks shall i flush now

[St. Tom]

as title says im growing 2 fast and vast and one royal critical 2 of them are grren and great looking but the last week 1 fast and vast at the back of my tent has developed bad yellowing they are 62 days old so there passed the strains 8 week timeline but i dont know what is causing it on one plant they all share a 47 ltr res and are in autopots with70 pcent coco and 30 pcent clay pebbles im feeding them 8 ml of floranova bloom same as since week 4 but i gave it monster bloom first time 2 weeks ago .also i have a cooltube that i cant higher up as its at the top i thought it may be heat or light but my temps never go over 82f also i was going to let them finish this feed and flush them for 10 days or 2 weeks

any help id be very gratefull

 

[St. Tom]

(bump) any advice guys i changed my feed tank to just ph water and was just going to start the flush i dont know what else to do

 

[Eyes on Fire]

i dunno much about hydro from a chemical standpoint. i would ask brother @Muddy i know he told me he was poking round in the hydro sections. i would totally ask him man.

 

[St. Tom]

i dunno much about hydro from a chemical standpoint. i would ask brother @Muddy i know he told me he was poking round in the hydro sections. i would totally ask him man.

Thanks pal i will try snag him today the strange thing is my other fast and vast is unaffected

 

[Habitual]

looks like its just finishing to me. water and chop

 

[St. Tom]

looks like they are finishing to me. water and chop

Thanks so so much for your input i had to empty my res before i done anymore damage they are 9 weeks old on Tue anyway I'm not to worried thanks to you guys now

 

[Tetra9]

Just my 2 cents,it's too late to do anything. Looks like you had a lockout at some point (because of the severity) but she is leeching and swelling nicely. If I were you I'd stick to the water and start cutting away the dead stuff while she finishes up.

 

[Tetra9]

I don't know if you were topping off instead of complete res. changes during your grow but that can cause issues depending on the Nutes you use. You can end up with pretty big swings and deficiencies, especially in a shared res. Furthermore, dunno if it helps but regular pH checks are very important because the pH will rise as your plant eats

 

[St. Tom]

Just my 2 cents,it's too late to do anything. Looks like you had a lockout at some point (because of the severity) but she is leeching and swelling nicely. If I were you I'd stick to the water and start cutting away the dead stuff while she finishes up.

Thanks once again I fell quite positive now least it's at this late stage but as you said the buds seem to be coping well thanks to you all

 

[St. Tom]

I don't know if you were topping off instead of complete res. changes during your grow but that can cause issues depending on the Nutes you use. You can end up with pretty big swings and deficiencies, especially in a shared res.

Plus you hit the nail on the head i would let it get to a 3rd and top it off checking pH and ec