Re: Some of my past fishy friends...
EOS 40D, 50mm Macro, Carbon Fiber Tripod, Off camera Flash Overhead, 2 Diffused side lights, A book of foreign curse words, and large quantities of Rum (for me not the fish).
The 4 Biggest mistakes people make...
#1 They do not turn off the filter at least an hour before shooting.
#2 They do not shoot in the darkest conditions possible. (late at night for me).
#3 They try to handhold the camera.
#4 Do not clean the glass before shooting.
Once those things are done the rest is all fine tuning and getting your mad skills going.