this is not all personal experiance,just a little info......
water deep enough to swim in(completly submergeable)
and a landing area for basking,
feeding,blood worm,wax worms,guppys,snails from your
fish tank.veg can be offered,
feeding the food live can help,it's ment to excite them more.
vitamins:D3,vits with calcium,add to food a couple of times a week,
maybe cut the earth worms up into small bits.
wash hands after handling,or anything to do with the
turtles or inclosure as Salmonella is something
they carry,as do most if not all reptiles(i knew that bit)
please watch small children,they are susceptable.
i think Tangy has got these.
any good ? :)