As far as my camera setting goes, I shoot everything in RAW, ISO 64, manual mode the mating cuttlefish picture was shot in macro mode, F4, 1/125, strobe power 1/4.
The mantis shrimp was in macro mode, F8, 1/80, strobe power at 1/8.
The clingfish was also in macro mode, F8, 1/200, strobe power at 1/8, the ghost pipefish was in macro mode F8, 1/2000, strobe at 1/8. Generally for most macro shots, I start at F8, 1/125, strobe at 1/8 and go from there.
The cuttlefish was a good 18 inches long and they are very common in Burma. I saw at least one or two at almost every divesites that I went while in Burma.
The macro lenses that I used were the Inon UCL-165.See here for some info on the lens:
http://www.uwdigitalcamera.com/English/eM67lens.htm