I have a Procambarus acutus acutus. Very cool cray and lives in a tank with my ropefish, bichirs, and peacock eel. I sometimes see my ropefish underneith the cray just hanging out. Many times the bichirs sit right in front of the cray, sometimes touching its face, and it doesn't seem to care, hasn't tried to kill anything in there other than the bladder snails which I'm ok with lol.