They each belong on the crustaceans of ‘decapod’ (that means they may have ten legs), but shrimp are from the species Pleocyemata Although lots of species Possess a status for aggression, 1 group of cichlids, the 'earth eaters' are known for their rather peaceful temperament and awesome colours. Look at https://cooked-shrimps69000.blogrenanda.com/38401584/not-known-details-about-pistol-shrimp-for-sale