Will saltwater jellyfish Ever Die?

https://tysonosxf971.skyrock.com/3325014266-14-Common-Misconceptions-About-realistic-jellyfish.html

A nice size for just a 10 gallon tank. Adjustable top and slowly but surely sways with water existing. About three inches extensive and 6-7 in duration. Worthy of the acquisition on the web than in every other