Thank you very much for taking the time to type all of that out. Here's the answers to your questions:

1. He is roughly two years old

2. He feels heavy and his shell is very thick.

3. He lives in a tort table that we made for our outside patio so he is getting natural heat, light, and humidity. The humidity is pretty constant at roughly 70-80% lately. The temps are always just over 80*. His substrate is a mix of playsand and cypress mulch, and he has a small pool that is in in all the time. We see him in it every day. Half of the table has pretty deep soil so he can dig, and we have a black cloth hanging over this half so that he can sleep there. He doesn't have any exercise room in there, but we let him have free roam of the house from time to time and we take him out into the yard for 30 minute increments.

4. His diet is mostly hibiscus flowers since they're in abundance here and he loves them more than anything. He also gets romaine lettuce and whatever grasses he chooses to eat while he's outside. We've tried to give him orchard grass (we have 4 rabbits and that's their favorite hay so we have PLENTY of it) but he hates it. He has never once touched it. We tried timothy and he wouldn't touch that, either.

- Aside from the hay, it seems like we're doing everything just as you suggested... Will the hay really make that much difference?