The leaves on the shoebox are different on either side of the plant
depending on whether it was the 600watt reflector bulb
or the 400 watt standard bulb.
I think there is another factor affecting the leaves,
and that is now that the roots are grown out of the shoebox
and into the rez,
they get a shock when I add nutes
or adjust the pH rapidly.
I am not having these problems with the 4 inch aero,
because the roots are stuffed up into the tube,
and have been manually kept out of the rez.
The plant I just harvested in the space shuttle
had some "rusty" symptoms,
but the other two do not,
and the simptoms were a little different
than you see on the shoebox.
The two plants under 400 the eye hortilux bulb
are looking better than the plants under the 600 watt reflector bulb.
I moved the eye to my 4 inch.
I also ran some AN Overdrive
for a week at 200ppm
in addition to the A&B
giving me a TDS of 700ppm
which was a mistake.
50ppm of Overdrive would have worked.
I also did the same thing with DM Potash Plus,
running it alone for 1 week at 220ppm.
Now I just use the P+ to adjust the pH
which comes out to about 40ppm P+
out of a total load of 300ppm.
So most of my problems can be solved
with better management on my part.
I haven't locked down my nute profile yet,
but I'm getting close,
and I am going to modify
the space shuttle again
to keep the roots from being shocked
when I make adjustments or add nutes.
I like the shoebox
if I was only growing one or two plants
or in a closet .
The shoebox design needs to be modified
to keep the roots from growing into the lower rez.
I'll get some root shots for you when I harvest the shoe box.
I hope it will only be a couple more weeks.
If you build a shoebox or other type aero system,
take some pictures,
then send me a link to your grow.