I've been running a Reef Octopus BH90 on my 60g since February. When it works, it works great. But any time it's shut down for any length of time (to clean it, power outage, whatever), it will pull clear water, foam, and overflow. I have to literally sit there and babysit it until it decides to behave properly again. It sometimes takes days. It's been off now for a couple of weeks because I just don't have time to deal with it. It'll do the same thing if I go too long without cleaning, too. I'm about ready to throw the thing out the window. Looking to move to an Aquamaxx after the first of the year.