Painters can paint the same scene every day and see something different every single time. Monet did this in his impressionist paintings of haystacks, lillies, and anything else he found to be beautiful. Key West snorkeling is the same way. You can go out to the same spot every day and see a totally different scene. And it's not just that there are different fish there each day, it's the quality of the light coming through the water, just what Monet was painting. It's the vis- some days it's very blue and clear. Freedivers and spearos call this "blue water", which is optimal conditions for seeing and spearing fish. Some days you can only see 10 feet in front of you. This day, the vis was ok in some spots, but tinted a very distinct green. We called it Green Water Day. Take a look.