My 1ct worth.... I grow a few of my hybrid phals in this & I've had tiny bits of "white stuff" appear from time to time on CHC.. I just toss out the 'white bit' and think... oops I didn't give it enough air circulation after watering... even if it means putting them outside for an hour or two to get the top part of the medium damp instead of wet.. it's a fine line...... and better to be drier than wetter...
'White stuff' could also be salt accumulation from fertilizer... As Wynn said above a pic would help alot.
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