Well, this probably wont help, but this is my enclosure for my baby red foot. I found this acrylic tank for about 15 dollars on craiglist. Try searching around on craiglist.
If you want to purchase a very simple tank, shouldn't cost you more than $100 for all the supplies you need for the turtle.
- 20 gallon, at petco you can a dollar per gallon deal. $20
- UVA and UVB should cost about $40
- Basking Dock $15
- Filter $20
- Decor (If needed)
- Heater(Not needed by...
Try to get some heating for the turtle. I would recommend a glass tank, with a heater in the water, a basking area, a filter, and higher water level for the turtle to swim, and he should do much better.