What is this? Just above my pool light.

Thanks for the responses... yes, the cover is removable. It screws on. It has been full of algae since I can remember. Because my pool accidentally drained over the winter, I finally was able to take it off and clean it out since it is not underwater. I think it may be related to fiberoptic lights that go around my pool that I never use. They are very dim so maybe this is just an indicator that they are on??? No idea.
 
Yeah, that's a fiber optic light lens. Even though they're dim, a good cleaning and a new lamp might brighten them up a lot. Do you know the make? there'll be a tower that houses the lamp and color wheel probably near the pad pr power panel.
 
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