I just bought an otto last week from Petsmart and he is thriving in my 29g community tank. It does have a lot of soft green moss in it (on the walls, etc.) though, so I don't know if that is why he is doing so well or not. I have also heard that they are hard to care for, but mine seems to be doing great. I did take about an hour to drip acclimate him, however. They only had one of the little guys in stock and he looked well fed, so I took a chance....