Does the text show irony? If yes, what type of irony was used? Explain your answer:

Gay tried her best to take care of her little sister's pet fish while she was away for a school trip. On the very day when Lala was to return from her trip, Gay found the fish floating belly up in its bowl. Not wanting Lala to feel sad for the death of her pet, Gay went to the pet store and bought a fish that looked very much like Lala's fish. Unfortunately, Gay had not noticed the tiny white spot on the tail of the new fish. When the young girl was reunited with her pet, she immediately asked, "Sis-Gay, how did Mr. Wacks' tail get a little white spot?" The question caught Gay off guard. She looked around nervously for a few seconds, but soon recovered. "Well, Lala, Mr. Wacks must have wiped some of his orange coat off on the rocks at the bottom of his bowl." Lala was content with the answer and proceeded to empty all the rocks from the fishbowl the following day so as to prevent Mr. Wacks from losing any more of his beautiful coat.