Contact the company you ordered it from first. IMO, it they don't require you to return the sponge as proof, then keep it in your tank until it starts to fall apart. There is always a slim chance it will make it, though it is an extremely slight chance. I just wouldn't want you to get rid of it until you were sure it was dying. If the company does need you to send the sponge back to them, then you should definitely do that because the chance of the one you have making it is very small.