I don't know if it's a stupid question, but I'm really interested in adding animals from the ocean to my tank (quarantined of course) such as hermit crabs, crabs or invertebrates, even fish if possible. Is this possible? They will be from the Mediterranean sea, and I don't know if the temperature would be the problem, since they live in 13°C and my tank is 26°C. I had that one crab as a kid and it was extremely hardy, but died sadly, from the mistakes I made with him...