I have what I believe to be a Kleinia Fulgens. It has been outside on a deck under a porch pagoda covering and to the best of my knowledge has not been over watered. A few days ago I noticed tiny black spots on the bottom portion of the leaves and stems. I do not see any type of insects on the plants. The spots will not rub off and can't be felt in any way, only seen. Any suggestions would be greatly appreciated!