i tried it alot a few years ago and as long as the fish were alot bigger then the turtle it wasnt a problem, but when everyone in the tank would get excited sure enough a fish was right there at the wrong place at the wrong time and the soft shell would not hesitate to bite. the larger the tank the better and start with a small turtle and big fish if u must. deffinatly a sweet site when they are togeother. my fish are too expensive these days