hi everyone

I just get my first sulcata!! he is a cb 06 baby. I have him outdoors in a 20 gallon terrarium, and he looks pretty healthy. But I read and reserch a lot about food, and I see that Buffalo grass is great for the high fiber, and I offer my baby sulcata buffalo grass and he just ignore it, I offer a little alfalfa and he eat it right away, should I keep feeding it on the alfalfa or shuld I try other things?

Thanks
Manuel Cantu