With their brilliant yellow eyes, French angelfish (Pomacanthus paru) are just as likely to swim right up to a diver’s mask and stare in as they are to eyeball each other.Photograph: Carlos Villoch/Specialist StockGreen moray eels (Gymnothorax funebris) grow to nearly 2 metres in length. During daylight hours, they are more normally seen lurking among the rocks than crossing the sandy seabed.Photograph: photolibrary.comIts magnificent long antennae often give away the lair of the nocturnal spiny lobster (Panulirus argus), which tends to hide under rocky overhangs during the day.Photograph: Robert Smith