Put the book up on the other side of the two sided fish tank. Did a lot of selective levels, hue/sat, & sharpening, some cloning, shadow/hilites, a little burning, High pass filter with soft light, NI
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I like your concept here, but this photograph seems to suffer from a couple technical issues.
First, it appears the camera locked focus on the plant at bottom right. In addition it appears you had a slowish shutter speed, which resulted in some motion blur. Perhaps it might have been better to open up by 1-2 stops to speed up the shutter. Even if you had to go to ISO 1600, the 5D can handle that quite well.
It looks like you may have oversharpened a touch, as there are noticeable sharpening halos in some spots.
This is a nice concept overall, though. I like where you went with it.
Pity not all of the fish were sharp. Did you use a flash? That might have helped you bump up the shutter speed to avoid the motion blur. Check out underwater/fishtank flash techniques on a site called www.strobist.com
I see some brown Zoo's that look good and very healthy. I can't tell what kind of Anemone that is (if it is). I think your Clown loves the camera, I have a 3 stripe damsel that loves to be in my pictures. I'll have to post some.