I noticed how discus eject water from the mouth to stir up food off the ground.

I noticed my female is more skilled at it than the male.

Following this I have started pressing bits of food against the glass above the water level a cm or so. She tries her best to get it, as the frustration starts she starts to eject water to try and knock it down.
1 out of 5 she is successful. I have tried to document her doing it.to no avail. Kids and animals ey.

Has anyone else experienced this?