I have two tanks, a 29 gallon and a 45 gallon. In addition to the fish and snails in each there is a crew of ten Amanos. They are absolutely tireless workers and make for a great cleanup crew! They consistently mow down algae and clean plants, decorations, glass, the substrate. Just make sure you also feed them something, as well, and make sure they're getting calcium!
They are a ton of fun to watch and if they're in a large enough group will be visible and active. Make sure to leave them some places to hide, as well, though.