Sadly, hobbyists should NEVER release their animals back to the wild. Most hobbyist tanks contain items from outside environments. All aquariums can harbor foreign bacteria and diseases that could cause a collapse of the local ecosystem, most won't but the chance is not worth taking for the sake of releasing an animal.
There a few (not many) public aquariums that use open water systems (their water and all animals within the tank are local) and will release the animals. Even this can be iffy but great care is taken to keep the environment populated with only local water and animals and to keep the environment safe.
There a few (not many) public aquariums that use open water systems (their water and all animals within the tank are local) and will release the animals. Even this can be iffy but great care is taken to keep the environment populated with only local water and animals and to keep the environment safe.