Fiddle Figs are very resistant to spider mites because of their tough, leathery leaves. I don't see any evidence of spider mites or any other pests on yours.
If your plant was not close to a sunny window previously, then the discoloration of the leaves may be due to inadequate light. Improper watering can also cause these symptoms.
The location it is now in, is good. Water it as soon as the surface of the soil feels almost dry.
It is normal for this plant to lose some of its lower leaves occasionally as it adds new growth on top.
