We have a 55 gallon that is home to a largemouth bass. He has lived here happily for almost three years. Today he looks sick! He is still active and following us around, but seems to be weak and leaning. We have wellwater and have had a lot of rain lately increasing the hardness of our water. Could this be causing problems? We don't know much about tanks, but this is the only condition that has changed recently. Thanks for your help!:1zhelp: