Listen to pleccy. Unless you have a couple hundred gallon tank, there is no way you can keep most stingrays, let alone a shark. Jellys are specialized also. The best thing for you to d is check with a local pet shop and see what they say..or the local aquairum if there is one. Some fish are not legal to keep, so keep that in mind.
Exactly what species of shark, stingray and jellyfish are you talking about? Many sharks grow very large, require specialist care and some species are on the CITES list of endangered species. Only the most experienced and dedicated marine fishkeepers should even contemplate keeping jellyfish.
