by the time I find them, they have been damaged and usually swim in circles for a while before settling somewhere in the tank and eventually die.
This 3rd one has passed away too.
I just have one left .. Sharkey. He will be lonely but I'm not sure what to do. If I get more and there's something in the tank making my otos sick, that's not good.. or if it's the filter itself and curious oto cats run out of lives , that's not good either!
I might try the sponge thing though I've resisted that because I don't want to have to clean it every week! (It's in an awkward spot at back of tank that's deeper than my arm reach)