it does not look as if there were any reflections. just have a look at the water: it gets more and more black towards the horizon were usually reflections replace refraction (fresnel). so put a chrome ball into your scene and check if it shows up any reflections from the skybox. it is just geometry. this scene uses a sliding volume. so if you are using the water material from the ocean demo the brown tint may be simple caused by the color of the under water fog set in the material. ocean demo: reflection intensity = 0. ocean demo: reflection intensity = 1.