Brown spots on phal

[jimkamal]

Hey guys. I bought my phal, which I named, violet a few weeks back and really loved it. I live in honolulu Hawaii and a few days after i got violet, I repotted her to a full bark and sponge rock mix. A few days after that, I realized that the leaves got really droopy so I would water it more often because the bark would get so dry after 3 days. It was potted in full sphagnum moss when I got it. The roots looked healthy but I'm not comfortable with all sphagnum mix. It's sitting on my east facing window and only get morning sun. The leaves never got plump again so I repotted it in a sphagnum and bark mix that I made my own. I wanted it to hold a little bit more moisture because I know that phal does not like to be completely dried before watering again. A week later the leaves looked like it perked up a bit more but then I realized brown spots at the corner of a few of violet's leaves. Does anybody know what causes this? Please help!! I will post picture soon