Underwater Effects

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Aquarium effects

I am developing an aquarium with interactive fishes. I would like to put some good looking effect there. I have basically the fishes done and would like some environment effects. I plan to put some rocks and the ground with normal maps, some interactive grasses, … In particular, I want to put in water shadow effect (any reference ?), water bubble effects (any reference, shall I implement with particles ?), fog like effects (for better depth view). Any good references, advices, examples you ca…

What you probably want is:
-fog
-caustics
-bubbles
-god rays