I have a 10 gallon tank with four goldfish. My tank has been set up for 8 years, and only one of the original four has died so far. I don’t have any ammonia or nitrate test kits and I’m going on vacation today so I can’t get them.
One of my goldfish refuses to eat and lies on the bottom of the tank of its side. I’m not sure if it’s a disease or ammonia poisoning so I moved it to a temporary bucket in case it infected other fish. Can someone tell me what’s wrong?