Phalaenopsis Help!!!!

[ljon0001]

I have a long history of killing orchids, but havent given up yet.... I am on my fourth now and it seems to be losing its health quickly.

It finished blooming so I cut the flower spikes all the way back. There is a new leaf growing.

The leaves, however, are showing signs of problem....

1) many of them are splitting
2) there are white soggy spots which I have applied neem to
3) 2 of the leaves are drooping
4) on all of the leaves, the tips are turning lighter green and are noticeably thinner than the rest of the leaf

it is currently in front of a bright window, with no direct sunlight.
i water it when the roots appear white-ish
i fertilize with water soluble orchid fertilizer once a month
it is sitting on a humidity tray

what am i doing wrong?? help!