The reason he looks nasty is because they are feeding him feeder goldfish, I personally try to get my fish of feeders as soon as I can and I get them on any type of shrimp
Man, Its sad to see that! As much money these guys dump into their Restaurant you would think they coud spend a few extra bucks and take care of the tanks!
Most of the time restaurants don't know how to properly take care of fish, especially silver arowanas.
They just want it for the looks but don't care for its well-being.