All species of Soft shell Turtle are totally unsuitable living in the confines of aquaria with fish.These highly active predators grow to at least a 12" shell (carapace) the most commonly kept sp is the Chinese softshell (Pelodiscus sinensis)........this is a disaster waiting to happen,are you sure your turtle isnt a Flyriver(FRT)? Many FRTs will live alongside fish but in my experience they have a tendancy to bite and remove the Stingrays tail.........imo not worth the risk!