Kaikoura, I know its not related to the topic, but your stocking lists in your signature are pretty bad. Come to chat some time and get some advice or make a topic, your fish get WAY to big for the tanks they are in.
And about the turtle, I believe a 90g would be enough room personally. There are much smaller turtles though. Maybe you should look into some musk/mud turtles.
__________________
|