I'm not a big fan of fish pond shots, as the fish are often less then sharp and clear. Whether it's the water clarity, or reflections, they generall don't work all that well. Nice title, as you got my interest.
Manual focus is the way to go for fish ponds and a polarizing filter would help get rid of the water's glare.
http://www.paddling.net/sameboat/Images/filter3.jpg