My Ferocactus wislizeni became an ant home and I ignored possible damage. Now I don't know how much damage they have
         done to the crown. Suggestions welcome
      
      			
      
         
            
               
                  | Ferocactus wislizeni | 
               
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                  | Wintered 5 years in MD, top injured by ants, staus uncertain | 
            
          
      
      			
      The body of the plant is healthy.