mystery oncideum with possible problem

[ben]

I also posted this on the ID forum because I'm sort of asking two questions.

I purchased this several days ago and was curious to know more specifically what it was. The pattern inside the bloom looks a bit like a butterfly or moth and that is what was originally attractive to me.

FYI, I am keeping it near an east window and water it about once a week. I basically water it until i is running out the bottom and don't water again until it is fairly dry. It is in an orchid mix with rock gravel at the bottom for drainage.

I would sure appreciate any attempts at IDing this as well as any input on best care for it (I might be doing something wrong).

I also have to more I plants I will post shortly.

This is my very first post on an orchid board by the way, thanks in advance.