Why have the leaves on my moth orchid gone bronze rather than green?
Check the light: Phalaenopsis (pronounced fal-en-op-sis) need bright but not direct sunlight. In the wild they usually grow as epiphytes under the canopy of trees. When you water, do so in the morning and note that although they need humidity, moth orchids soon develop root rot if left sitting in water. Standing the pot on a pebble-filled saucer half-covered with water should help. Once a fortnight try feeding the plant with all-purpose liquid fertiliser at half the usual strength.