I know oto cats are hard to keep sometimes because theyre wildcaught..but I bought three to put in my puffer tank. Two are very active but I can't find another. I figured the other one is just shy... but cleaning today, I can't find the third anywhere... I checked everything, figured if he died it would be stuck to the filter intake, because it wasn't floating at the top... not there. Not behind the filter. Could the other Otos have eaten him? I don't think the puffer could have , the puffer is half the size... maybe if the otos started, the puffer finished... I don't know.