Treatment  Tank  Pairing  hours_6  Day_1  Day_2  Day_4  Day_6  Day_7  Necrosis  
Elevated   1     1        0        0      0      15     3      1      31.057    
Elevated   1     2        0        0      0      8      3      0      32.418    
Elevated   2     3        0        0      0      6      3      3      24.224    
Elevated   2     4        0        0      0      15     8      3      22.614    
Low        3     5        0        0      0      0      10     0      14.892    
Low        3     6        0        0      0      0      10     0      38.85     
Low        4     7        0        0      0      0      0      15     18.41     
Low        4     8        0        0      0      0      6      3      24.158