Saltwater invertebrates, or inverts, as the aquatic community call them, are essential creatures to have in your tank. Not ...

But they’ve always been popular with aquarium owners because of their hardy nature and vivid appearances. Also known as anemone fish, the various species make beautiful and fascinating marine pets.

The clownfish and the anemone—their relationship has captivated home aquarists since the 1970s, when improvements in the shipping of fish and in tank design and filtration caused a boom.