 If you liked
Pichi Pichi Pitch: Mermaid Melody
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 ...then you might like
Chiisana Oningyo Biyori
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Nice Day For a Little Mermaid and Mermaid Melody are two manga aimed at girls/women about mermaids. The main character is a mermaid who lives with at least one other mermaid and has a crush on a human guy. Mermaid Melody's mermaids are more of a magical girl type though, while Nice Day features mermaids as adoptable pets that are as small as regular fish.