Yes, that's one of 4 whale sharks that are in there. And the huge trough is a natural wave maker. It fills up periodically and dumps in the pool of water you see in the picture. Which is the top of a reef display room with an enormous reef wall below. It's literally the top of the reef. This room has a big skylight in the roof for natural sunlight and 1,000's of watts of extra lighting. It also houses the filtration system and has tons of vegatation, mangroves growing in it, clams, inverts & fish. Here are some pics of the top with a wave coming through, and another of the actual reef room below. The shark isn't really going after the tang. It just turned out that way in the pic. lol! If you ever go, take the tour. It's awesome!