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how often can RES have sweet potatoes?
My baby RES (2yo) wouldn't eat any vegetables besides sweet potatoes, can I feel it to them (2x/week)?

Sweet potatoes are pretty rich. I wouldn't offer it any more than once a week. In between times keep offering him the green leafies - they'll eventually be his staple. Turtles consider anacharis and some other water plants to be quite tasty too. My turtle loves fresh basil - he would eat it before he'd eat anything else green. He absolutely loves sweet potato too, by the way. Isn't it odd - in nature a turtle would never ever get to eat a sweet potato.

I give lightly-steamed sweet potatoes or yams every week to week and a half (it depends on what's on hand). They're good in that they're high in beta carotene (Vit A).