Hey guys 
Ive been having this problem for about two weeks now.
let me tall you about my setup first.
I have a 90x90x120 grow tent with 4 autoflowers growing (diesel strain) in 3 gallon airpots, in pro-mix BX. Im almost at the beginning of week 6 and dont have long left to go.
I have an inlet fan pulling air from my window, supplying fresh air to the tent and it is being pulled out the tent through a carbon filter, through a cooltube (that currently has a 600w HPS in it), and thenpulled out the tent via the outlet fan (and exhausted into my room).
I had a problem with overfeeding near the start as this is my first grow and i burnt them a couple of times and shocked them when i transplanted them to 3 gallon airpots from a 1 gallon normal pot, but then they started to bud.
Lately after I had transplanted them I fed them some foxfarms at about 1/4 strength and they started showing brown burnt spots and yellow tips on the leaves. It started getting alot worse and i thought i burnt them again but it started to look like a cal/mag problem so i fed them some epsom salts. This didnt fix anything, they just got worse and now almost all the old leaves are gone now and im left with the bud site leaves, which are also starting to go yellow at the tips and severly burning and curling right up.
My PH for them all is at 6.5, is this right for pro-mix BX soil? as ive read that it should be between 5.8 and 6.2 for this?
I have added photos so you can better determine the culprit.
P.s. the smallest plant in the pics that looks the most burnt with all the curled up leaves at the bud sites I gave a flush yesterday afternoon and today it looks like its burning up more.
Please help, I dont know if I should flush or feed, the other 3 that I havent flushed are nice and dry in the soil, so they are ready for a good flush or feed.
Thanks in advance guys!
Ive been having this problem for about two weeks now.
let me tall you about my setup first.
I have a 90x90x120 grow tent with 4 autoflowers growing (diesel strain) in 3 gallon airpots, in pro-mix BX. Im almost at the beginning of week 6 and dont have long left to go.
I have an inlet fan pulling air from my window, supplying fresh air to the tent and it is being pulled out the tent through a carbon filter, through a cooltube (that currently has a 600w HPS in it), and thenpulled out the tent via the outlet fan (and exhausted into my room).
I had a problem with overfeeding near the start as this is my first grow and i burnt them a couple of times and shocked them when i transplanted them to 3 gallon airpots from a 1 gallon normal pot, but then they started to bud.
Lately after I had transplanted them I fed them some foxfarms at about 1/4 strength and they started showing brown burnt spots and yellow tips on the leaves. It started getting alot worse and i thought i burnt them again but it started to look like a cal/mag problem so i fed them some epsom salts. This didnt fix anything, they just got worse and now almost all the old leaves are gone now and im left with the bud site leaves, which are also starting to go yellow at the tips and severly burning and curling right up.
My PH for them all is at 6.5, is this right for pro-mix BX soil? as ive read that it should be between 5.8 and 6.2 for this?
I have added photos so you can better determine the culprit.
P.s. the smallest plant in the pics that looks the most burnt with all the curled up leaves at the bud sites I gave a flush yesterday afternoon and today it looks like its burning up more.
Please help, I dont know if I should flush or feed, the other 3 that I havent flushed are nice and dry in the soil, so they are ready for a good flush or feed.
Thanks in advance guys!
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