I think this little one thinks it’s a cuddle bone instead of cuttlefish bone??? All of mine nibble at it and in as such I’ve not felt the need to add any calcium to their foods. They have a very varied diet with only fresh grown stuff that is healthy for them. They will only eat mazuri if I chop some weeds up and mix with it lol. I have the ls mazuri but am going to buy some of the original formula to see if they like that more. Anyways they are doing super well and have all almost doubled in size since they came about a month ago. I love them? Here’s a really cool flower I grew too??? It’ll be food soon!