some fish need hard water and some fish don't like hard water it all depends on what type of fish you have. As far as removing chlorine there is several products that do it I use a power chemical called perfect Ph 7.0 it brings the Ph level to within 6.9 and 7.1, it removes chlorine and hard metals in the water. And there is another chemical called Prime it takes out the chlorine and gets the nitrate and nitrite levels in a good range too.