I was watering my orchids today and thought I would finally take a picture of this. One of my catts has a leave that is completely yellow and has now totally curled in on itself. The leaf next to it has a brown stripe running down it. The rest of the plant looks healthy to me, its putting out new roots. Is this a bacterial thing?? Should I remove it from the rest of the plant?? I had purchased these plants at a large flower show in the area. They have never really taken off and I'm wondering about the quality. Looking back on it now I wonder just how healthy these plants were to begin with