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Maybe those sepia catfish(form the sea/ocean) bones, turtles can nibble of them as They please. I do not know of i got the right name for the bone looks like this.
For my RES I soak about 5 blueberries in tuna juice once a month. When I got him he was in bad shape from improper diet and his scutes were hanging but never shedding properly and I read to try the berries and noticed a difference quickly after feeding them.