My goldfish has been sick on and off since I got him from a friend who got him at a carnival last August. Sometimes it’s white spots, sometimes it’s dark specks, sometimes he’s bloated, sometimes he can’t swim off the bottom of the tank BUT sometimes he’s totally fine. His water quality is good, I’ve tried aquarium salt and medications and nothing seems to work. It’s like he just doesn’t have an immune system. I’m moving soon and can’t take him, but I don’t know where to rehome him if he keeps getting sick. I don’t want to make fish at a store sick or any other hobbyists’ fish sick. Help. Please.