Hello all,

Totally new to orchid hobby and this is my first post.
Few days ago I bought some plants at Home Depot. One of them has very pale green leaves. Also one of the bottom leaves is completely yellow. The rest of the leaves are beginning to turn yellow as well. It starts from the centre of the plant as you can see from attached photos.
I really don't know what this can be and how to treat the plant to save it.
Any help will be greatly appreciated. Thanks so much.
Slobo