Well, I wouldn't say it looks like a washing machine. The surface is moving though. It's a reef tank and I only have 2 small perculas in it. The only reason I ask is because they only stay in the corner of the tank and then when I turn the power heads and filter off for feeding, they go all over te place, but as soon as those are turned back on it seems like they are swimming for their lives and back to the corner they go.
I don't have a lot of coral either...gsp's, xenia, some devils armour and a hammer coral