The brown patches at the top are from damage done before you got the plant. I think it may have been bacterial. Since you don't live in a greenhouse with high humidity you probably won't have any problems with it.
Like Will said, great potting mix for aeration just hard to rewet or get your finger into. I had a love/hate relationship with it when I did interiorscaping because of that and the porosity meant that I had to water slowly to not overflow the saucer in the deco pot or basket.