Hey guys. thanks for the comments.

)
Gooseberry, the 10-17mm is great. Its as good as the 15mm Sigma, but will a little more wide angle.
Melshee, the trip was a special discount from the asia dive expo. 50% off!!! But thats 50% off the full "suggested retail". So it wasnt that cheap, tbh.
Beivied, yah sorry. It was a night dive and the guy appeared right in front of my friends mask. Without knowing what it was we put our hand to it and to our surprised he landed and sat on our hands!
Oh and thats not the moon! i think its my ds-125 strobe!

I place it far in front and tried to light the jelly from the side.
Pauche, I think you need both wide angle and a macro. with crop factor of 1.5 or 1.6, 50-60mm macro is a good start. 100mm and long is more difficult as focusing is slower and camera shake is more pronounced.
Eudon