Hello! First post of a very worried owner! Thought I'd come and post online while the little man is still alive to see if there is anything that can be done! or if anyone has seen this type of problem before. We have 2 Fancy Goldfish - tiny little things for about 8 months now and they have been amazing however one of them has completely changed its habits and I'm frankly worried that she inst eating. We have them in a Biorb 30 (please don't complain!). We use the standard ceramic media in the tank that has a number of white and fake moss stones across the top. We use the standard Biorb filters that we change every month and do a big 40% water change when we swap them out that we obviously treat before hand (sometimes using the Biorb packets and other times with TapeSafe). I mentioned one of them is completely fine, he loves swimming around picking on things, always comes for his food and although is a little shy-er, he doesn't complain at all! The other however has been sitting at the bottom of the tank, and not opening its mouth at all as far as I can see for a few weeks now. She does swim around if you go closer to the tank and she sees you but otherwise she'll be tucked away. Also when food is around, she will come to the surface but never eat anything! We feed a mixture of decent flakes and mushy peas depending on the day. I've taken an ammonia test for the tank and although not the most accurate it shows elevated levels compared to the control sample from the tap and I was given a Biorb First Aid kit that i'm currently using for the next 2 weeks (only started yesterday). We have also increased the number of water changes we do to 3 each week (20% each time) rather than a 50% each week. They never get stressed at all after the water changes. here are some links to the pics on my onedrive: http://1drv.ms/1KwdmJg Control water sample: http://1drv.ms/1SDkag0 Tank water sample: http://1drv.ms/1SDkdsn Ammonia kit used:http://1drv.ms/1WDEZaj Close-up video of Fish sitting at tank:http://1drv.ms/1WDET2F I can get a ph test tomorrow also if needed. Hope anyone can help! Please Dr! Save my Fish!!