Good luck with your otos. I just love them. Got three of them about 20 days ago to help eat up the diatoms in my tank. I thought at first that it would take alot more than that, but I couldn't believe what a great job these three do. They are such neat lil guys and Ive really grown to love them. What personalities they have lol..
I know sometimes when I look around for them, I cant find one or two. You would be surprised how good they are at camouflaging themselves in among the plants. So don't worry yours is probably just hanging out on a plant leaf somewhere. Good luck with your otos!!
