Hi:
No changing colors does not mean the water quality is bad, as i mentioned in the first post, it can be from a number of things, often times its mood related, other times tankmate related, and thrid water quality. There are prolly a million other reasons as well.
NOW the circling and heavy breathing is not usually a good things-but there maybe answers.
Did you feed him recently? Live FW feeders? is he eating SW flesh? Do you see anything going on w/ the pec fins, eye coloration, do you see him shedding?
Can you describe your setup? tankmates? feeding regamin, anything else we need to know
frank