Originally Posted by Ajsim
I didn't know that oto's eat the micro organisms or bacterial film in a tank, but if they do, great!
I ran a test tank a few years back with 6 healthy otto's I had for over a year. I cycled a 10 gallon and threw them in with a piece of drift wood, some gravel and 1 anubias coffeeola. the dirft wood was covered in a leeched white film when I put it in.
I never fed them, and performed weekly 25% water changes. I added 1 drop of fertilizer per water change for the plant. I kept the tank running that way for 6 months and the otto's bellies were always that nice rounded full. Within a day the white film on the drift wood was gone and never came back. At the end of 6 months I broke the tank down and put them back in my 55 planted.
Now before you jump on me about not feeding the fish, I did check on them daily. Had their bellies ever been anything but full I would have fed them, but they never needed it. It may have been the wood leeched enough food for them, but the would be on the glass, gravel, anubias, and filter inlet their little sucker mouths constantly working!
Otto's are a catfish at their roots and will eat whatever they can find that is edible to them ;)