I bought 3 Otos, they were the healthiest looking ones I could find (that's not saying a whole lot either). Two of them look good, fins up swimming around, they're even schooling it seems. They are all isolated in a cycled and planted QT. The third, not so good. Dorsal fin is clamped down and so is one on his lower left side. He's also not doing circles like the other two.. circles for like 3 hours straight.. he just sits there smucked on the glass until one bumps into him - then he switches to another side. Aside from the fins and lethargy, I see nothing wrong with him/her. I just bought them a couple days ago. The color of his/her back is light brown, more noticeably brown than the other two. Water Parameters: pH: 7.2 KH: 4 drops Ammonia, Nitrites: 0 Nitrates: >10 Tank is Cycled.