A long time ago a world full of dragons unicorns in mermaids and other mythical creatures that people felt were never real and tell now although no one checked does not mean there were real or not.
Mermaids roamed the sea colorful coral all around big enough to make a home mermaids often eat fish because that's all they had there to eat fish sharks and other things that lived in the sea sometimes mermaids would go into the rocks and sing a lovely song living in the sea was hard for the mermaids mainly because of sharks and things bigger than them a sharp teeth difference species of sharks were the main problem.