In your original post you say that the orchids are potted in Hydroton in a net pot, which I can see in the pictures. To clarify, this is not the same as potting them in S/H. S/H allows for a reservoir of water to remain in the pot at all times to keep the medium moist. When you water in your current set up, it's really not that different than having potted them in bark...the only difference being the Hydroton won't break down like bark would.
Also, keep in mind that the areas of the medium that you can see will always be drier than the core (i.e., what's underneath what you're looking at). Onc's like to dry out some between each watering, so watering daily (even with Hydroton) might be considered overwatering.
To give you an idea of what I've done with a few catts: I have a few catts in regular clay pots potted in Hydroton and I water them as if they were in bark. This translates to 1-2x a week in the winter, 3-4x a week in the spring (it gets hot in Dallas very early) and almost daily in the summer when the temps really start to rise.
I am not an expert by any means, so maybe I'm missing something. Hopefully more people will chime in with advice.
Good luck!
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