I have a magnesium deficiency that has started to show up and I am going to give a foliar spray later in the week. I haven't dealt with it as I saw it in all my other grows. It seems these LED reallly use a lot of mag so from now on I will have to increase the amount of epsom salts. I think I might have to refresh the feeding.
I really like powered nutes as I use a lot less. The starter packet will last me years at this rate.