The six shark number was six BABY whale sharks. We'll see how it works out with four in there long term. Yes, Japan has had whale sharks way before the US. However, there is very limited info coming from them at this point. Georgia's are from the same collection team. My thought is it's too small for six. Especially when you add in the other rapidly growing animals. Several of the other sharks will be in excess of 15 feet as well.
Both sharks were conditioned to come to a small boat for food while confined to holding pens prior to being shippped out of Asia. They both ate within hours of being introduced to the display from a small boat. This was completely unexpected at the time, but a gret sing that they were comfortable after transport 1/2 way around the globe. Feeding is done by pooring buckets of krill and other chopped food into the water. They don't swim and feed like would be seen in the wild, more or less it's poored into their mouth for them.
The exhibit is also equipped with a movable bridge supported on an I beam track. This is to allow easier access for dive entry and other misc exhibit care needs.