If it was me i would start with
bamboo shark.Only reason is, its really the only shark i ever been around in a home aquarium.Think its smaller than a horned shark but not buy much.Most probs i seen with keeping sharks is they dont eat or injury themselfs. One time when i got the guts to ask my lfs to order one,I asked for small bamboo shark.Well i was there the day the shipment came in a he got a Freaken 2' nurse shark.Was not what i wanted + i think there aganist the law to own one.But after that i never did get a shark i just watched my buddys shark. There not all that neat really kind borning just swim at the bottom of the tank.
