Do Hermit Crabs Eat Algae: Facts, Food Choices, and Limitations

Yes. Hermit crabs are considered omnivorous scavengers, meaning they are not picky eaters. But, as for whether hermit crabs can survive on just algae, this is uncertain. So it’s best to feed them a balanced diet with lots of vegetables and small invertebrates to ensure they get all the necessary nutrients.

Algae for Hermit Crabs

Can Hermit Crabs Eat Just Algae?

The answer is yes. Hermit crabs can survive on algae as their sole source of nutrition, which is why they are often seen feeding on algae in aquariums. If you have a colony of hermit crabs that are eating only algae, feeding them any food (other than water) is unnecessary. Hermit crabs also eat small invertebrates, such as insects and larvae, so they’re omnivorous. 

Algae is a rich source of protein and other essential nutrients for these invertebrates, so it is a great way to provide them with the necessary nutrients.

What Kind of Algae Does a Hermit Crab Like to Eat?

Some hermit crabs prefer algae high in healthy nutrients like protein and minerals. As discussed, algae is a good food source for your crab if it is fresh and uncontaminated. 

In addition, some hermit crabs like to eat green algae that have a slightly sour taste.

Saltwater Hermit Crabs Control Algae Growth

If you have an algae problem in your aquarium, it’s essential to consult with a professional. However, there are some simple steps that you can take to help control the growth of algae. For starters, place a fresh batch of live rock in the aquarium with your crabs for them to snack on. Additionally, clean out the crab’s tank regularly to help reduce the number of algae that needs to be eaten. 

Saltwater hermit crabs eat large quantities of algae, which helps to keep their tanks clean and free from contaminants. If the crab’s food intake is not meeting their needs, try supplementing their diet with some bacteria tablets or flakes.

Vegetables and Fruits for Hermit Crabs


Hermit crabs can eat grapes! As a food source, grapes make an excellent choice for these invertebrates. Not only are grapes a good source of fruit, but it’s also a great source of water. Hermit crabs can extract all the juice from grapes, including the nutrients they need to survive and thrive. So, give your hermit crabs a grapefruit and let them enjoy the sweet taste of paradise!


Feeding them whole strawberries is not typically recommended as they contain high sugar levels that hermit crabs may be unable to digest. Instead, try feeding them small pieces of strawberries or fruits that your hermit crab may enjoy. If you notice any behavioral changes like your hermit crab eating less or drinking less water, it might be a sign that they are not getting the nutrients they need, and you should take them to the vet for a check-up. 

As for food, hermit crabs can be fed a wide variety of food, but they are not typically known for their taste in fruit. So, experiment and see what your hermit crab enjoys the most!


Yes, as hermit crabs do love apples. They prefer it more than eating strawberries. In addition, apples are a great source of fiber, which benefits the hermit crab’s digestive system. Apples also contain Vitamin C and other minerals that help keep your hermit crab healthy inside and out!


Bananas make a great addition to any hermit crab’s diet as they are high in potassium, vitamin B6, magnesium, and more. Bananas also provide excess sugar that is not harmful to most invertebrates like crabs. However, if you want to feed your hermit crab whole bananas, be sure to peel them first so that their nutrients stay intact.


One dish that hermit crabs can enjoy is tomatoes. Note that hermit crabs don’t typically like wet tomato slices, so try to feed them dry ones instead. While it’s not their favorite food, they will eat them if offered in the wild or feeder tank. In short, hermit crabs are opportunistic scavengers who will eat anything available to them!


Carrots offer a good source of carbohydrates and vitamin A, which are beneficial for hermit crabs’ health. You’re doing them a favor and ensuring their health and well-being.


The answer is a definite yes! Blueberries are healthy food for hermit crabs, and they enjoy them. So, go ahead and give your hermit crab some blueberries – they’ll love them! 

In addition, blueberries are high in antioxidants, so they can help protect your hermit crab’s body from harmful chemicals and other toxins.


Yes. Feeding celery to your hermit crabs will help them digest their food better and increase their lifespan. You can also closely monitor your hermit crab colony – adding new members or changing diet dosage regularly can help keep everyone healthy!

What Do Hermit Crabs Eat In Captivity?

Hermit crabs are omnivorous scavengers and need a varied diet that includes algae. Ensure the algae you provide is good quality, as hermit crabs are known to discard food quickly. You can also provide your crab with hiding spots so they can scavenge for food without fear of being disturbed.

Do Hermit Crabs Eat Coral?

Hermit crabs can be a nuisance in the aquarium, as they love to raid food stores and eat anything and everything available. However, it’s okay for them to eat coral if they find it while roaming around your tank. Feeding hermit crabs a high-quality commercial algae food will help prevent them from eating coral, but be sure to remove any pieces of coral from the crab’s diet before you put them in with other fish or invertebrates.

What to Feed a Hermit Crab From the Beach

Hermit crabs from the beach also require a different diet than those in captivity. This means they need more live food and fewer pellets. So be sure to provide them with the proper food to stay healthy and happy in the wild.

What Are Hermit Crabs’ Favorite Foods?

Hermit crabs don’t have favorite foods as they are omnivorous and opportunistic scavengers that eat whatever is available.

Don’t Feed Hermit Crabs This!

Although hermit crabs are omnivores, it doesn’t mean that all kinds of food are good for them. If you’re worried your crab is eating something it shouldn’t be, check if the food has ethoxyquin as part of the ingredients.