Welcome to the forum .
If your using PrimeAgra then the wicking action will be fine.In any s/h setup there is a gradient of wetness as you go up the pot I.E. wetter @ the bottom & gradually getter drier as you go up the pot.
If where the plant is situated it gets lots of air movement & light the top of the medium can dry out , this isn,t a problem but i spray the medium (not the plant) for a couple of weeks to help new plants establish.
I would hold off the fert for a couple of weeks & refill the res when it gets 1/2 full.
The Phals i,ve put in s/h establish very quickly & grow very vey well.