I should probably mention what the controller does.

It controls up to two Seio Superflow pumps and creates a surge where it brings the pump from 50% capacity up to 100% capacity. You can do that in as fast as 15 second intervals to 30 minute intervals. I found that 12 minutes seems to work well for my critters.

It also has a feeding setting in which you can shut off the pumps for 8 or 16 minutes (your choice) to feed your corals and fish without having everything blown about.
Then after 8 or 16 minutes the pumps come back on to the preset interval.

The unit also has an off switch to shut both pumps off completely without having to unplug them.

Price is negotiable.