Welcome to OrchidTalk. I would advise you to post a photo of the phal you think may be having trouble. I also recommend repotting both orchids in separate containers until you get a handle on growing them. There are some really good articles here in the forum library about phalaenopsis orchids. Check out the following links: (BTW - the one on Semi-Hydro is just for information. I think you should repot using the bark mix you just purchased.
Phal-a-normal: So What's A Phal Supposed to Look Like?
Growing the Phalaenopsis Orchid (Moth Orchid)
Semi-Hydro: A Repotting Pictorial