Aquarium fish are some of the toughest things to photograph. Both lighting and Focus are the major challenges. You've done an admirable job with the lighting, but the image sustains quite a bit of damage from the fact that the fish's face is well behind the plane of focus, but the tail is razor sharp. How can you cure this? With a living subject you can't afford to stop down because what you'll gain ind depth of field, you'll lose to motion blur. One option you might consider is trapping the fish between the front glass of the aquariun and another piece of glass maybe an inch or so behind the front. That way the fish will remain parallel to your plain of focus and you can be assured of uniform sharpness.
Big Bad Fish
in Animal
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