How can i get rid of the blackness when looking in water (water example levels)

I have been struggling and wondering about this. When you play Water Planes or Sun temple and go near the water and look at it the blackness will come all around edges of screen. When you look far away the whole ocean looks nice. What is causing this blackness and do any of you know how to get rid of it?

Here is the blackness when looking down

Far away everything seems nice.