IN most cases jellyfish won't survive in a home aquarium because of a dnagerous predator found in every single one called a FILTER!!
Jellyfish are very weak swimmers and get sucked up in overflows without fail.
Here's a local one called an Upside Down Medusa that does better than most.
Mike
Most jellyfish just die in short order as they are filter feeders and can't get away from an overflow.
Since we have them all over down here, you just KNOW that in 35 years of keeping local saltwater critters I HAD to at least try, right? **grin**
Mike