Just to answer your questions:
Dark spots are not a good thing.
About watering - I would simply take your Phals to the sink, let room temperature water run through the medium, let it drip off and place the plants back into their spot. Many people mist, I have never done that, I simply water. I do not drench for an hour. If water collects during watering in the crown I would gently tissue that out, as not to invite rot.
Now how often to water? Stick your finger into the medium, it is still damp don't water. There is another way to tell if water is needed, it is called "hefting the pot". Lift the pot after you just watered it and also lift the pot when it is dry just before you need to water. Get a feel for the dry and the wet weight of your pot. After a while, just by picking up your pot, you might have a good idea if you need to water or not.
Light conditions - good light but not direct sun, that will burn the leaves, but perhaps behind a sheer curtain might be fine.
