2009 CSI:Miami  Kill Clause

Eddie Cibrian standing next to one of 4 jellyfish aquariums created for the episode.              

No, that big jellyfish tank does not actually have coral in it. That is the magic of television!  Jellyfish cannot exist in a tank with coral or anything else abrasive such as gravel or rocks. Their delicate tissue will be damaged against such surfaces. Some things are only for TV!!!