Oncidiums like even moisture, never going completely dry. If your watering schedule improves, the overall health will improve.
As far as reblooming a Phalaenopsis, that is a matter of the overall age and condition of the plant.
1- a seedling or young Phalaenopsis should not be allowed to rebloom on a spike. In most temperate climates, after the flowers fade, the plant should be allowed to make new leaves which are good for the overall health of the plant going forward. They should NOT be allowed to rebloom just to make their owners happy!
In sub-tropical climates, where leaf growth is constant, they can be allowed to rebloom.
2- a mature Phalaenopsis, one with 5 leaves or more, a minimum of a 12" leafspread, those plants have enough reserve strength to have the energy to produce more flowers.
It is advisable not to have it reblooming from the tip of the spike but more towards its base!!
