Phal. bellina with moldy roots exploding liquid - Terrifying

[Orchid Whisperer]

Also, unless you live in a really dry climate, don't pot Phals in sphagnum. Though it is not impossible as a medium, it is difficult for the usual hobby grower to manage moisture with it. Roots often die from staying too wet.

Bark or other well-drained medium works much better (again, exception for arid climates). It allows the medium to become nearly dry before watering again.