Hi,
We are somewhat new (1 year) at tortoise care. I would not supplement if they are getting a tortoise diet and dark green veggies. They are getting what they need. You can over supplement, people do it all the time to themselves. The diets these days are very good. We have had noticeable growth on your Yellow foots in the last year. They eat Mazuri,escarole, endive,sweet potatoes and the leaves,squash, carrot, some fruits,small amounts of other vegges. What is the protein that you offer? we have a 6" red foot that goes nuts for cooked chicken. Do you have a pic?
Amanda