no idea m8 as ive never used fox farms but ph has to be around 5.6
otherwise your plants wont be able to take in all the nutes
that could be why they are yellowing a bit
have you got good airation in the buckets ?
Yes i have 4 air stones and the ph right now is around 5 i don't have anything to put my ph up atm so im wondering do i go ahead and add some nutes or wait till i get it 2morow