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So I began with a 10 gallon tank and some goldfish and suckerfish. I decided to go bigger and moved up to a 55 gallon tank. In it I had 6 goldfish, 2 suckerfish, 2 koi, 2 balla sharks, 2 red fin sharks, and 2 Oscars. They were all small so the tank wasn't crowded. Everything was going fine until I moved. In the first day I lost 4 goldfish. Second day lost 2 goldfish and 1 koi. Third day lost the last goldfish and the last koi and 1 suckerfish. The balla and red fin sharks were eaten by the Oscars. So I got rid of the oscars and bought an angel fish and a small catfish. I took out everything and scrubbed everything with just clean water and a clean tank brush. Refilled it and added some chemicals to balance it out. I even added an air pump system in case that was the reason. Got it all back together and tested it. The only thing wrong was hardwater. I put the fish back in and that first night I lost my angel fish. I dont know what happened but no matter what I do since I moved, they all keep dying. I'm pretty sure I'm about to lose my last suckerfish. I love having a tank and fish but I cant figure out why it seems to have bottomed out or how to fix it.