My first ever goldfish seems to be very unwell. We got him in July but I've no idea how old he is or how long they live for. I feel terrible not being able to do anything to help him. I thought if he died we could bury him and use it as an opportunity to talk about death with 5 yr old ds. He's been looking almost dead for a week but seems to rally several times a day. At this point it's an exercise in terrible suffering by the looks of things. Should I just flush him?