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Magnificent Sea Anemone (Heteractis magnifica)

The magnificent sea anemone is a classic clownfish host, but it is one of the hardest anemones to keep. Here is what it really needs.

The yellow boxfish is adorable as a juvenile, but it grows large and can release a toxin that kills tank mates. Here is what to know first.

The rock beauty is a bold black and yellow Caribbean angelfish, but its sponge-based diet makes it hard to keep. Here is what you need to know.