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First one:
RES shed right? Cause Yohan had something going on with his skin falling off, it didn't look like he was in any pain and he was a little more aggressive then usual. Eventually though it stopped and he's back to his chillaxing self...

Second one:
What in the name of my grandmother is cuttlebone? Everyone talks about it... is it a food?

Thank you! :'D

*kung fu fights away*

Yes, they shed. Water that is too warm can cause excessive shedding so make sure your water temp is suitable for the age of your turtle.

Cuttlbone is the bone of the cuttlefish. Found in the bird section at pet stores, walmart, etc. It is a good source of calcium. Make sure to remove the hard backing before feeding.