Due to my previous lack of experience, I nearly killed 4 phals just like you. The same exact story.
You did the right thing by removing that moss. But now pull that plant out of the pot (nice pot btw), and trim all of the dead roots off. Leave only the ones that are firm.
Than re pot. I used bettergro orchid plus (also from Lowe's) for a few months. I also bought a little humidifier from Walmart for $16 and have been using it every other day on low. Then recently I've notice quite a bit of new roots. One of the four just started to spike!
The plant looks good, so there is definately hope. Remember bright spot, no direct sunlight.
Oh, and only water once a week when it becomes dry.