I had a few rupiculous laelias a few years ago. I had them growing well in terracotta and gravel (granit) .
Never water an orchid with velamen roots just after repotting! This is what I've learned after many losses and a few decades of growing orchids.
An orchid generally will not send a (new) root into a moist medium. Dry medium and high humidity will trigger roots. Wait until they reach 2cm of lenght before watering. This is for orchids with rest periods. (Pleurothallineae grow differently).
You may want to give your laelia very bright conditions and up to full sun after adapting to it.
Don't move your plant to look for new roots. They might appear long after a new growth has begun. Any disturbance is a no go for new roots.
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