They are some of the most unique and beautiful creatures on earth. That being said, they should not be kept in the home aquarium. There are only a couple that I think should be, given their needs are understood and met. The one you have pictured could never, ever be kept mainly because it feeds almost strictly on *Portuguese Man O War jellyfish*. These Nudibranch store the venom from the jellies, making themselves much more venemous. They spend their lives floating upside down on the ocean surface...drifting away...they sometimes wash up on the shore in Florida. Hope this helps...