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Oh wow, thanks! The restrictor is a great idea. I tinkered once with restricting the flow using a zip tie but didn't get very nice results.

My current iteration - which I haven't uploaded yet - uses a little custom printed circuit board I made with a little microcontroller on it. The microcontroller PWMs the motor down to the lowest speed I could get it before it stalled. It also makes the electrical connections mechanically easier since it has an onboard power jack and voltage regulator, meaning you can plug in a garden-variety wall wart of any voltage up to 15v. And finally, it supports a button on the front of the fountain; when you press it, the fountain runs for 60 sec and shuts down.