you can have ethier a turtle tank or fish tank. not both. i know there is some cool comunity tanks w/ turtles on this website that also have fish but most of us don't have a 1000 gallon tank. turtles love to eat fish. in the wild thats almost all they eat. they love worms even more. that together makes any type of birchir in a tank a no no. even with a divider. ive kept birchirs for 6 years and dividers don't mean anything to them. putting a birchir in that tank is like buying a dog to put in dog fights. they both have a grim outlook on life