How do your plants look today? I was thinking I have never used Magic green but I have heard really good things when you get a deficiency. I know it is cheap also(20 bucks I believe) so if your plants don't improve you could always try that out because foliar feeding with that will be able to fix a bigger range of problems then Epsom Salt(unless it is Sulfur like you believe). I was curious how does the light feel above your plants when you hold your hand there for awhile? Have you noticed any fringes sticking up on the top leaves?
They do still have a yellow look to the shoots, but I think it's getting better. I don't know if Magic Green can be purchased in Canada, but I will ask the guys at the hydro store. Sounds like a worthwhile $20 to spend.
I considered that it may be from too much heat/light, but the shoots directly under the bulb look just the same as the shoots off in the corner that are receiving much less direct light.
While the lights are very close to the plants I can hold my hand there comforably all day if I wanted to. I don't see any signs of heat stress on any leaves. I also have a string I hang from the light, when the plants get higher than the bottom of the string its time to raise the light. I've checked the temperature with a remote thermometer probe and directly under the light the canopy doesnt go above 80
I think it's getting better though, I will see what the warm nights do, as I've read that cold nights can lock out certain nurtrients. These are supposed to be very sativa in lineage and ought to enjoy it
Just bought some Ona Gel, it seems to be working quite well, with the lid only 1/4 unscrewed
Just bought a 5.5HP 8 gallon Shop Vac, It made watering a million time easier.
watered 3.5 liters per plant, water in ppm 800 pH 5.8
water out ppm 1300 didnt check pH(probably 5.7)
I need to think of a way to prop the pots up off the bottom of the trays so that roots in the bottom of the pots don't sit in any extra water If I had glass marbles that would work, I'm thinking of using lego blocks. Anyone have any ideas? Hydroton could also work, but that seems like a waste of money. I wish I had used an inch of Hydroton in the bottom of the pots, but I forgot to do that