 If you liked
Pichi Pichi Pitch: Mermaid Melody
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 ...then you might like
Maigo no Kemono-tachi
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The Stray Beasts and Mermaid Melody are both shoujo manga featuring a somewhat pink-colored mermaid as the female protagonist. She falls in love with a boy from a species not her own, and she unfortunately has to try her best to not reveal she's a mermaid or else she may die; the former features demons who literally eat mermaids like the main character, and the latter features the classic Little Mermaid penalty of turning into sea foam bubbles. So expect a somewhat star-crossed romance with some cute art.