nlbford
Contributor
Scubatooth:there is no CA (purple fringe in this photo) and with CA theres really not anything you can do for it as it is a result of the lense of the camera and refractory of light.
I see some in the corners (upper left in particular) around the anemone tenticles - but hardly a lot worth extensive correction. There is so much more as far as color, exposure and sharpness that is good in the shot and thus it doesn't really factor in.
And there is something that can be done to correct such aberations - and very accurately and specifically if one is so inclined. In fact, a long while back someone here had a terrific link to an article on doing extensive CA correction that was very technical but very effectoive and dealt with just the kind of abberation that takes place in this photo. I wish I still had the link. I might still on my old office computer. I did a search not too long ago on such articles and didn't find that particular article, but I did find others that were variations on it and some looked quite good.
The fixes I have seen were quite technical - and didn't involve simple uses of a few PS filters and tools - but they did get the job done.