Classic idea (viewing from different angle) and well executed. I like the edges of the plant-thing, but the green-blue tint should affect the colours of the fish a little more to get the feeling that they are IN the water rather than in front of it.
awesome perspective change. I think it would be a lot better if the fish on the far left and right were removed. The single goldfish would be great, and it's the only fish that really looks like it's part of the image. Otherwise, I love it. :)