Pat Sajak sunk an aquarium owner’s morale Wednesday after he jokingly called her a “downer” when she revealed that two of her fish had killed her other aquatic pets. The revelation came at the top of the show when contestant Mariah Feliciano told Sajak, 77, that she recently “started partaking in aquarium life.”“What do you have in there?” Sajak asked.All too thrilled to talk about her fishy friends, Feliciano told the game show host that she had “some shrimp, snails and guppies.” “And then I got two other fish I wasn’t familiar with and I named Piranha and Predator because they killed my other fish,” Feliciano continued, eliciting a slight chuckle from the audience but causing Sajak to look startled.“Really a downer,” Sajak mumbled.