While dojos and kuhlis might be compatible together, their temperature requirements are different. Kuhli's require tropical temps, and dojos are coldwater fish. They can tolerate the warmer temps, but it will shorten their lives. Dojos shouldn't be kept in water above 70F for long periods of time. If you want your dojo to live it's entire lifespan, which could be up to ten years for some, you'll need to put it into a coldwater tank with temps between 65F and 70F.
-- bigmamafish