Originally Posted by Earl

I have had the same symptoms.

I think it is from the roots being in the rez
when you make pH adjustments
and changes to the nute load.

This happens to my plants in the space shuttle.
Only the plants with roots in the rez.
the other plants weren't affected
until they grew roots long enough to reach the rez.

In the 4 inch aero unit
I lifted the roots and put them into the tube
and they were trained to grow there.

I didn't have this problem in the 4 inch system
because I kept the roots from growing into the rez.

It is probly not too late to stuff the roots into the tubes.

You just need to make sure the tubes are draining well
after the roots fill them at the drain end.

I calilbrate my pH meter
every time I mix a new batch of nutes.

5.9 seems a little high and will inhibit the uptake of calcium.
AN recommends between 5.5 and 5.8
so I use 5.65-5.75
I would use a product like Botanicare Cal-Mag Plus
to add calcium if you need it.
Not lime.
I think the lime will lock out soluble calcium
without bacteria to break it down.

We don't want to have any bacteria in out aero systems.
There is no benefit
and some negatives.(smell, cloggs, etc.)

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Originally Posted by Earl

It's fun to grow fast !

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Originally Posted by growinman

Those roots look completely amazing in there like that!! Those look like some real stout stalks already as well.
I can imagine the relief you must feel that the issues have been straightened out and rapid progress is back in gear. Right on!!

Dont forget to bring your camera when you head out in the bush!!<---that'll be cool!