My 6yr ild DS got two goldfish for his birthday. We set up the tank 3 days before we got them as we were told by shop. It has a filter. One of the fish have already died. :-( ive feed the twice in the week we have had them. What did i do wrong? My DS is away till mon so does not no, im hoping to replace it before he get back. Also the other likes to limply hang by the filter, so much so i thought it was gone too and went to fish it out with net, untill it swam away. They are normal goldfish btw.
Any advice would be greatful. Thanks