Thanks for the reply. I too got Canon 100mm macro lens, but never been able to get a shot up close like that.
I guess patience is the key :P
Yes it is a lot of patience. Plus I do not use a tripod, no use in using one, the shrimps move too much. The camera with the lens is heavy.
I have sat and taken over 100 pictures of shrimp in one sitting just to erase them all because they are no good.
These things are a pain to shoot, but the payoff is when you get that good shot.