reflection render correct but the effect you want is not it... see the image above for water, here you can change the color of the water but the reflection will stay always actual, if you put in a plane with clouds textures above the scene and set the reflection node to black it will give you wonderful reflections of the sky ball with the displacement waves effect. Hugs! Cath
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"Surrender to what it is - Let go of what was - Have faith in what will be "