Sustainable Aquatics has been my favorite source for captive bred and tank raised livestock for almost two years, and they continue to add to their repertoire almost every month. This month, however, I was surprised more than usual: they've started breeding Cassiopeia upside-down jellyfish!
These photosynthetic jellies are fairly easy to keep in captivity provided an aquarium dedicated to their display with fairly good lighting, a sandbed, and very little water flow. Available at around 1" in size and very reasonably priced, these guys would make a neat little biotope for those interested.
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