Yeah as long as your system can handle the load.

My fox face was stresse and half black for 5 months. Then when I added my yellow tang he started coming out and regained his yellow color

I think she was joking.

Because they are constaintly exposed to people walking around near their tanks.

At home we arnt glued to our tanks 12 hours a day, eventho we would like to be.

+1 Once we get them home they aren't exposed nearly as much to people. Leash included in her reply that her tank is in a high traffic area. IMO, that helps tons.

Maybe because they are hungry? They usualy starve them so if someone ask to see the fish feed, it will feed.

Also at the LFS they don't have places to hide, so that does not reaffirm their instinct to hide. Same thing with aggressivity usualy. You can have a tank full of discus and if there is nothing in the tank except filtration there will be no fighting at all...but put just one piece of driftwood and bye bye peace.

I think if we had no where for the fish to hide, they would get used to be in the open and lose most of their fear.

I have a niger trigger that was ok at the LFS when I bought it, but there was no place in the tank of him to hide. IN my tank I only see him at lunch time and the rest of the time he's underneat my liverock in a large cave that he digged in the sand. No fish are attacking him, as I only have a copperband, pajama cardinal, occelaris clownfish and mandarin...so it,s not because he's been attacked...don't ask :( It's not acclimatation either because I have him for more than a year now. At feeding time he's a beast...but as soon as he's full it's skittish mode again.