In germany laws exist that demand that you make tests to get a certificate so you can have certain animals like parrots, snakes, caimans and so on. Some animals must be registered by the authorities. From time to time a vet comes and checks how they are housed. I think such a law would also be great in USA and for fish. Take the RTC for example. Thats a fish 99,9% of people can in no way hold in their house. You see those small juveniles in the petshops and you know that they will most likely die a slow and agonizing death. I think people should make a test before they can buy such animals and i think annual visits from a vet should be obligatory.