Tokyo-based Genesys World is selling futuristic fish tanks [JP] that are specifically designed for Clionidae, tiny sea slugs, which are often referred to as sea angels.

The so-called Qulio fish tank makes it possible not only to view Clionidae, but also to breed them. Until now, they could only be seen in special facilities like aquariums. Genesys World says water currents resembling that of the ocean are generated inside the tank so that Clionidae can live and grow just like in their usual habitat.

The Qulio fish tank costs $900 (at least the slugs never have to be fed) and is Japan-only at this point.