fantail

I have a fantail fish and he is swimming weird, like upside down or 'laying' on one side. Also, my comet fish isn't eating. I changed the water tank today. Can it be related to that or are they sick?

I've been trying to get as much advice as I can about this problem. I rescue some goldfish in May and have had them going strong since I got them. One of them is a fantail with a deformed mouth. He's been having swim bladder issues since day one but has been going strong up until now. It seems...

Hi I've had berty (a ranchu) and Klaus (a fantail) for about a year and a half. Berty has always been healthy but Klaus has suffered from finrot a couple of times and has had problems with his swim bladder but both problems seemed to had gone away. yesterday Klaus died. On Sunday he seemed...