I agree with all that suggested that it needs more moisture. I also like KSRIR suggestion in using a wooden skewer (or the wooden tip of a pencil) or a digital kitchen scale for monitoring the moisture of a pot.
A wooden skewer/stick/pencil will turn darker in color when it gets damp, and a kitchen scale will give you the weight of the potted plant in ounces. The problem I see with using a scale is that as the plant grows it will weigh more, so one will have to account for that.
Anyhow here are three pics of a Dendrobium keiki planted in perlite. Also note that before watering it weighed at 13.62 oz and after watering 15.77 oz. However, I don't use this method as I have over 120 orchids, so can you imagine how long that would take? LOL!
Phals require a little more water than Cattleyas, so I will water more often. Won't say how often because it depends on your environment. Here in the island of Kauai, it rains almost daily ... so I have to take that into account. Good Luck!
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