Luckily, cuttlebones don't really expire, so no need to replace this before your bird finishes it. He'll also sometimes tell you if his meal doesn't look good enough. ... A little attention and a few precautions in storing and serving your bird's food will help ensure he's getting only fresh, tasty nutrition at every meal.

Can Cuttlebone get moldy?

Cuttle won't get mouldy it just suck maybe little bit color from peat nothing to worry about.

Is Cuttlebone supposed to smell?

They do smell sometimes because the cuttlebone is now a part of a dead creature from the oceans. Try slightly scraping it off ( the top layer), and see if that helps. If you are worried, get more and smell it.