It's hard to tell from the photo what sort of light lever the plant is getting. The flower distance from the light isn't really that important though the leaf distance can be. At 24 inches from the light source, if those are T5 lamps, the plant itself is probably not close enough.
Cats aren't likely to each orchids, though they may take a few test chews. If they DO bother them, your first, best option is a large, hungry dog.