I actually have a Dovii in my 750 tank. Had him for about 3 years. A big boy who nobody bothers in the tank. However, I once added in a Florida soft shell to my tank and I kid you not I went to the store for 15 minutes to get the turtle food, came back and the turtle was dead. Not sure who killed him, but it proved the pet store owner wrong who was sure the soft shell would kill my fish stock.