My eaten (thank you Picasso trigger) Harlequin Shrimp taken with a Canon EOS 1D MKII with Sigma 150mm Macro lens + 580EX flash on Off Camera Shoe Cord (held on top of tank aimed at shrimp) and Canon MT-24EX Macro Flash aimed at Shrimp (on Camera) while using tripod.
Aperture is about f/16