No, sand sharks will not be damaging to individuals. They're sluggish-moving sharks which have no want to communicate with or try to eat human beings. But, like all animals, they may be aggressive whenever they really feel their life are at risk. The cuttlefish has a shell on its head https://triptalesbooking52962.bloguetechno.com/the-2-minute-rule-for-aquarium-conservation-efforts-68357328