Bugger all... The water has a heat mat under the tank as the water must be kept at a constant temperature. A UV light to help maintain the shell and during winter a heat lamp is placed over his floating dock to help dry the shell out when he/she desires. A good filtration system too.

Oh and lots of fish lol

I also feed the turtle "Turtle dinner" which I normally get from Balcatta pet store. It is a frozen food with vegies and some form of fish...it comes in a little frozen cubes that you just push out kinda like panadol.

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....slow and steady wins the race....fark that!!