I've got a Aqua One Nautilus 1100, and until today i would of said that it was excellent, however, this morning it decided to spew the dead leaves etc back into the tank!! I cleaned it a couple of days ago, though have been told that they only need cleaning maybe once a month, if that, but i still do it weekly....I can tell you, I'm not impressed, i had just put new fish into my tank yesterday and am panicking that i'm going to get a spike. I've done a water change, so here's hoping everything will be okay. Tried to get some info as to why it would do that, but cant find anything. The tubes weren't blocked, so i don't know what happened.