Phals love to be moist but not wet all the time. They like warmer weather conditions 70 to 80 degree's. with a 10 degree drop at night if possible. They also need to be away from direct sun. In a window use a sheer curtain to protect the leaves from burning. Humidity is best over 50% as the love that moisture. Feed your Phals weak weekly when they are in the growing stage. That means half strength so if it is 1 teaspoon for gal use a half teaspoon to the gallon of water your using if not a 1/4 of a teaspoon to start with then go to the 1/2 tsp as we don't know if they ever had fertilizer before.
Now for the difference in your flowers on your orchid falling we don't know how long its been in full bloom so dont worry to much about that at this point. You mostly want to make sure your roots are fine your bark is fresh and your watering and feeding your orchid just right. Blooms can come later after you learn how to make it happy. Mushy roots may need to be cut away when you repot it. You want nice plump roots that will turn a greenish when you water them. You will see they go from a whitish color to a greenish. To tell if your orchid is ok with water use a wooden skewer and put it in the pot. Leave it there and when you think its time to water pull the skewer up and see if there is moisture on the skewer. If its real wet leave it for another day or two. If its almost totally dry its time to water. Good luck with your new orchids.
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