Like most aquarium problems this is another one of those problems that no matter how much you try to automate your reef tank by use of controllers, they will still happen when you leave town for a few day's. This time it happened to my 3 Koralia Evolutions. I have had these for about 4-5 months at the most, and when I came home they were all not working. I figured my aquarium care taker just fed the fish and they were still on standby through my reefkeeper controller. But sadly that wasn't the case. So I pulled them all out and switched them back out for my modded maxi jet. The funny part is, is that all 3 of them were broken at the same time and now they will only start up with the help of a finger. And even then they only spin half as fast as they did before. If it was just one, I would consider it just a mishap but since all three gave out at the same time, it just means that they are built like complete trash. You can see a video that I posted on youtube here http://www.youtube.com/watch?v=1v6aZ1so0ek. If anyone has any idea of why these did that, please chime in.