My favorite loach, the Dojo Loach, has the most personality of any fish I've ever had. Although she's totally not aggressive, she doesn't always stay at the bottom. In my 45ga I also have a pair of Lochata Loaches, 4 Panda Cory, a Bristlenose Pleco and a Clown Loach. The Clown Loach and Pleco...