Hannes -I experimented with adding various amounts of chromatic aberration at your suggestion, but I find that though it may be a very common sight in underwater photos I dislike the "look" of it. It is one of those lens characteristics that sort of jangles my eye and makes me want to look away.
Badger - I chose the description Cambrian Sea on purpose. I don't have any good fish models and by saying it was a Cambrian sea I figured I could get away with no fish. As I understand it fish were just coming into existence and only very primitive types in the early Cambrian age, but I should have put in some jointed leg Trilobite type critters.
