A Rio 1100 I have had for less than a year kicked the bucket on the evening of 6/7 and took most of my fish with it. It killed my 4 inch desjardinii, flame angel, scribbled angel, and 4 green chromis. Luckily I got my other fish out in time. As I understand it Rio powerheads release some kind of oil into the water when they go bad. And to make the whole thing worse, I got my order of 4 Maxijet 1200s the next day. I have also added a grounding probe. So for all of you using Rio powerheads, Be Warned and learn from my experience.