I have a bean animal setup on my 75 gallon. Works perfect! My occurences have been the usual snails of course. Twice though, for reasons I cannot explain, my return pump ramped up in speed. I came home from work to the sound of water rushing down the secondary and dry emergency drains. This of course drained the return section about an inch or so, triggering the ATO to fill it. No noticable issues though; just ramped the speed back down and the system restabalized. I have no idea why it would have done that, and only twice since I've owned it (almost 1 year this January).