Auto uneaten food removal

[cartery]

Has anyone tested a system to automatically remove uneaten food? I know you wouldn't need/want this in most cases, but, for example, with seahorses it could be useful. I'm imagining something like a feeder plate that sometimes gets used for Mandarins with an attached pump that clears the plate after 30 minutes.

 

[Kooma]

Reef mat?

Is this somewhere the water is calm enough that food settles? A pump on a timer would be a simple way

 

[cartery]

Reef mat?

Is this somewhere the water is calm enough that food settles? A pump on a timer would be a simple way

I guess I was actually thinking of something more like this https://a.co/d/0ckkHKP3. Then add a low power pump to clear the food after some amount of time.