Well I tried to add 2 of my cuttles together even though the oldest ( cuttle 1)was 3 1/2 " and the other(cuttle 2 ) 1 1/2 " . I tried use a mirror to get a reaction out of the laeger one but it didn't work . The cuttle 2 was upset and inked during release into the main tank and went dirrectly into cuttle 1 's cave . Cuttle 1 darkened immediatly and cuttle 2 took what looked to be a defensive posture and a mottled pattern . Then cuttle 1 attacked but missed and allowed me to remove cuttle 2 without injury ( except for hurt pride ). Cuttle 2 was being housed in a net breeder with a smaller cuttle (cuttle 3) without any problems . All cuttles were fed before the merge .