Ecosphere - Best gift for science enthusiast or an environment lover
Echosphere - Source: eco-sphere.com
This will be the best gift to give as pet, or piece of art, decorative items etc. But one drawback I felt on the actual product compared to impression I felt from the term "self sustaining" is, the shrimps in this will not last forever becaus they do not repopulate.
Followin websites you can find more information about ecosphere