One of my boys, Sassy, has major tantrums when anything in his tank changes. Like, when I turned up the flow on his sponge filter a tiny bit, he freaked out. I turned it down, he still flipped for a while but then calmed down. Changed the background, he wasn't having it at all.
Once I tried to put him into another tank (his brother's tank...tried to switch them). OMG. It was terrible. He just paced the back glass like a little robot. When I put him back, it took him like three days to calm down.
They can tantrum, and it's almost never small when they do. Eventually yours will get used to water changes and the routine of filter off/filter on, but it might be rocky for a bit. Hopefully that sponge helps a little.
Silly fish. When they're good, they're great, but when they're bad they're terrible!~