One of mine gets stressed out big time, but he needs it cleaning as he perks up afterwards. I tend to syphon half the water out and he doesnt seem to notice. Then put clean same temp etc water back in by tipping it on to a saucer so it doesnt disturb the water. There is nothing in bottom of his tank. just got his bridge that he rests on or under.
I do take her out when I do partial water changes (obviously I take her out for whole water changes ), because she totally flips out when there is any movement in the tank. She seems pretty calm in her little cup while I take care of business, but goes kind of nuts when she gets back into the tank (especially if i move any of her decorations).
I have to say, the saucer thing sounds like a pretty good idea. Maybe I'll try that, thanks.