Using Gargeer's hermit crab mineral supplement is super easy. All you need to do is sprinkle it over your hermit crab's regular food. This way, they can enjoy the benefits of the supplement with every meal. As for storage, keep it in a cool and dry place to maintain its quality. When handling the supplement, make sure your hands are clean to avoid contamination. Also, don't over - feed your hermit crabs with the supplement. Just follow the normal feeding routine and add the appropriate amount as a healthy addition. Remember, a little goes a long way in keeping your hermit crabs happy and healthy.