I agree with Shellonia...mine will eat stones no matter what. I break cuttlefish, I sprinkle calcium powder and bits but she still goes for the stones :/ The only thing that might have worked for me are snail shells...I've left a number of dried snail shells and she's interested in them and will bite them for a whole hour...i still worry that a broken snail shell might be sharp tho, but i read that they eat them in the wild, so...
I guess i'll have to live with a stone hungry hermann
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