Added an Oto for algae duty! It seemed to have worked fine, added him at night when beta was sleeping. The next day my little buddy didn't pay any attention until the Oto swam quickly. He quickly charged, flared, and snapped at the poor little Oto for two days. I realized then that he wasn't going to settle down. Therefore, I returned him for a snail. Hopefully this can be successful. Everyone was swearing up and down that certain species would get a long. I can now 100% say it really depends on the disposition of your fish. Good luck to anyone who tries it!