I encourage you to continue to observe how your Phals roots are doing. If the roots are bright green, no water needed. If the roots are grayish-silver then it is time to water. Another benefit of your growing culture is by holding the pot, you can determine the weight differential between a just watered plant and a plant that needs water. Some folks recommend poking the center of the root ball with a wooden spike and seeing if the end of it is moist, sort of like sticking a tooth pick into a cake to see if its done. I don't like that method as you might inadvertently poke a healthy root.
I own several Phalaenopsis hybrids and a couple of species. The big plants from grocery stores or home improvement or garden centers are often in bark. The plants I have bought directly from Phalaenopsis vendors are always in sphagnum moss. So I keep them in the same media they came in when I have to repot.
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