I used to have a rescued cichlid (never did find out what species he was) that was 'in love' with my best mate. Whenever she sat next to the tank, he'd start digging pits in the gravel, 'shimmy' up and down the glass and then swim backwards into the pit, waggling his pectorals and puffing out his cheeks.
"come with me to the casbah..."
"come with me to the casbah..."