I keep silvertips and otos, but not in the same tank.
Silvertips are very active and can be a bit nippy, but i see no reason why they cant live together. On the other hand, every group of fish are different and some fish are just jerks.
Only way to know is to give it a try. Its probably just curiosity, see how things go. Otos are mostly nocturnal anyway. Once they settle in they will find somewhere to hide out of the way during the day, and after that you will probably hardly ever see them.