ccCapt
Reef Hacker
I just picked up a new in the box Seio Electronic Controller at a really good price on Ebay. I hooked up 2 Koralia 4's to it and it works perfectly. I set it to go from 100% down to 50% and back up to 100% every 45 secs. The Koralia are dead silent as they are powering up and down. It's a nice unit and very easy to set up. The only downfall is both powerheads ramp up and down together. You can't alternate them.