That fish would have to be massively rare! Although I must say that personally, I am not a fan of that fish in terms of looks, but it would be a very good conversation piece (e.g "Well here I have the world's rarest discus") lol.
Still all discus are nice, some just nicer than others.
Errm, actually the best Satay in Malaysia is made in Kajang, Selangor... Penang has great Malaysian fare, but not really THE place to go for the best Satay.
That said, I'm meeting some mates in Penang for good food.... Nibong Tebal for seafood lunch (then off to see a farm around there), then Batu Maung for another good dinner of baked crabs....