viluah21 wrote:And may I ask how much exactly should I feed them? Can I overfeed them?
Overfeeding is not an issue: they will eat as much as they need and then stop (not like humans who will gorge until the food is gone

). If you're feeding
dry mix*, one teaspoon will last 3 PPs for several days. They love to have a variety of foods, not the same thing every day, so offer them food from your own meals (without seasonings or sauces). Try a grape, a small piece of apple, a bit of kale, a little piece of cooked unseasoned chicken each day in addition to their dry mix -- it will be fun for the crabs and will let you learn what they enjoy most and what they don't care for...one person's crabs will go crazy for raisins while someone else's will shun them.
I mentioned
dry mix above and a good homemade dry mix serves two purposes: it provides a healthy base of protein, grain and calcium and can be left in the tank 24/7. The base mix I make is easy and, stored in a tightly sealed jar, will last for months. This is what I use: Flukers Aquatic Turtle Medley (freeze-dried mealworms, crickets and shrimp), Wardley's Hermit Crab Food (100% dried shrimp), dried eggshells and uncooked plain rolled oats or uncooked multigrain hot cereal (i.e., Bob's Red Mill 10-Grain). Using a mortar and pestle, grind up 1/4 cup of Flukers, 1 tablespoon Wardley's, 3 eggshells and 1 tablespoon oats or cereal into a "chunky" powder. You can also add a sprinkle of uncooked quinoa, amaranth, cornmeal, chia seeds, etc., to the mix when serving.