Advice needed on roots of new Phal potted in sphagnum

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That is a wonderful clone.

Sphagnum is fine for orchids when the grower learns how to water it. Watering plants in sphagnum is very different from watering plants in bark.

Let the moss go crisp dry before watering. It shrinks and you can often slide the plant out of the pot easily to look at roots.

When it is crisp dar, run water over the top of the moss in the pot for only one second. That's it. The water will distribute throughout the moss leaving it barely moist and still full of air.

If your moss is all wet now, slide the plant out of the pot so it dries faster. Soaking wet moss will suffocate roots.

During hot times of the year, with a plant using a lot of water, you may be able to soak the sphagnum if the pot returns to crisp dry within a few days. But it's safer never to soak all the moss in the pot.

Sphagnum breaks down within 2 years. It is likely you plant is ready to repot soon. You don't need to repot into sphagnum but you could. Pack it quite tightly. This makes it harder to accidentally soak the moss.