Cattleya with black spots

[jesleo]

Hello, I am pretty new to the orchid world and I am looking for some advice. I bought a Cattleya a couple of weeks ago. I noticed two black spots on the topside of one leaf a few days later and didn't think much of it. Yesterday I noted black spots on the top and bottom of other leaves. The black spots seem to be heavier on the bottomside of the leaves. I removed one of the leaves because it was starting to fall off. I'm thinking it's spider mites. Can anyone confirm? What is the best treatment option? Thanks