Leaves falling?!?!

stasis

Member
400W hps , Canna aqua , ph 5.7 - 5.9 ( checked daily ) temp 68-78f

What would cause leaves to fall , in a aeroponic system?
It only started a few weeks into 12/12.

Mainly the lower leaves - but even higher ones that look perfectly healthy and green are falling. As much as a handful every single day from 4 plants! One in particular has probably lost half its foliage !!!

Could a high humidity cause leaves to fall??
Under/over watering shouldn't be a prob as its aero.
 
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