I put the Tunze Nano skimmer on my 56 all in one. I put it in my overflow chamber and it worked well for about a week. It stopped working so I pulled it out and checked the pump. It was clean and after putting it back together and testing it, it worked again for a day or two. Repeat. Repeat again. Tonight when I pulled it out, the bottom cover had come off and is now sitting out of reach at the bottom of my overflow chamber. What a waste of money for a small pump and and a cheesy plastic box.