i have a large heated pond in my spare room with two rock islands in it and glass fencing around it i used to have a caiman in it but sadly he past away after getting out i caught him but three days later he died.it has been a month now and i am now ready to get some thing else to keep in it i was thinking of red eared sliders and koi or some sort of large tropical fist to keep with the terrapins is this possible and if so can you recommend a large tropical fish that i can keep with turtles.