but they were not very bright My zebra otos all killed themselves!!...in thier ferver to rid my tank of all algae they all individually wedged themselves underneath my bubblewand and suffocated...they did it one at a time...every couple days i'd come home to another dead, stuck oto <sigh> I didn't really realize that THAT was killing them until the third one died, and i realaized he was actually wedged. I think I may stick with the common oto...its a little easier on the pocket book to have a $2 fish kill itself than a $15 one