Petco does not specifically guarantee saltwater fish, but they do have a 14-day return policy for fish. This policy states that you can return your fish within 14 days of purchase, as long as you have a receipt and the fish is in good condition. If your fish dies within 14 days of purchase, you can also return it for a full refund or exchange.
While Petco does not guarantee saltwater fish, their return policy does give you some peace of mind when purchasing fish from them. If your fish dies within two weeks of purchase, you can return it no questions asked. This makes Petco a good option for saltwater fish purchases, as you know that you will at least be able to get a refund or exchange if something goes wrong.