Do fish get depressed?

Hey guys...so I when I first started reefing about a year ago I got a scissortail dartfish, and then my second fish was a yellow clown goby. Well as of late my Yellow Clown goby has caused lots of problems with my acro coral and other SPS. So I removed him and he is currently in quarantine. Well the next day my scissortail is hiding! This fish is ALWAYS out...always! My other fish that were added later on seem to be doing just fine. Any possible way he is depressed. I seen his head, he looked at me and then seem to bury himself in the pukani rock as to say "I'm upset with you"...I have not done a water change, nothing! And the goby only took me 10 mins to get out. He wasent even that stressed, I just scooped him up no problem against the glass. I didnt move any rock work or nothing, it was a perfect capture!