These are really beautiful. It actually reminds me that I have a bunch of photos from a trip to the aquarium at the Oregon coast that I never posted about. I spent forever taking cell phone photos of the jellyfish, they are so weirdly alien and beautiful.

As far as ethical issues with jellyfish being displayed I would think they are pretty minimal. Jellyfish populations are exploding world wide as areas of ocean become too warm or overfished.