My fish lines in a 2.5 galling tank with a automatic heater and a thermometer. I got it yesterday (after my first one who lived for 2.5 years lived there) I cleaned it thoroughly and made sure no traces were left (of salt used to clean it). My other fish swam around a lot when I first got it but this one just lays with its head pointed up. I do weekly 100% water changes with tap water + conditioner + aquarium salt and feed it bloodworms and pellets, it also does not eat the food. It looks like the water is pushing him down, he is struggling to get up. What am I doing wrong?
