A Greek turtle is strictly herbaceous and it needs food with high fiber, low protein and calcium rich nutrients. Some of the food stuff which you can give it include :
1.      kale,
2.      dandelion,
3.      mustard,
4.      collard,
5.      turnip greens.
High protein diet is not given because it can cause renal failure in them. Fruits can be given but not too much. You can also give calcium supplementation.
www.wnyherp.org

 I give him leafy Romain lettuce, however i need to know HOW much to give him.  I've been doign a handful in morning and handful in evening and he's eating every shred of it.  Wonderin if i should be giving him more?  he is not touching this food that the pet store gave me (little green pellet food)