Do you have this question in your mind? What do red claw crabs eat? If you are keeping red claw crabs in the aquarium, then it becomes even more important for you to know this.
If we look at this question from another perspective, just for science or to know, all these questions can be answered: what do red claw crabs say in the sea or the wild?
Red claw crabs are beautiful creatures that are often found in saltwater environments. They are also found in the mangrove swamp areas of Asia, like India and Sri Lanka. If you want to keep them in the aquarium, then you must know what red claw crabs eat and how often they eat.
What Do Red Claw Crabs Eat in the Wild?

Red claw crabs can eat almost everything. One should also keep in mind that they are also scavengers. Their diet in the wild is very diverse and includes the following things in the wild:
- Everything that they can find to eat
- Decaying matters
- Small fishes
- Few Insects and their larvae
- Crabs used to eat Algae
- Crabs survive on Dead animals (carrion)
They used to live around muddy or sandy areas for food, and crabs are opportunistic eaters, feeding on nearly anything they can find.
What Do Red Claw Crabs Eat in a Tank?

When setting up an aquarium at home, red claw crabs should be fed a variety of food to match their natural habitat. Since they are omnivores, their diet should be balanced. It is entirely up to you how you mix up the diet. The list above will give you a good idea:
- Protein sources such as bits of cooked shrimp, chicken, or fish (used sparingly)
- Sinking pellets of good quality will be for bottom-feeder crabs.
- Different Blanched vegetables will add some mixture to the diet(like zucchini, spinach, peas, and cucumber)
- Sometimes Fish flakes or frozen foods (like bloodworms, brine shrimp, or mysis shrimp)
- You can feed Algae wafers
Tip: As you know the water of the aquarium should be as much good to live for crabs. Therefore, it is essential to remove unnecessary food from the aquarium. One should not keep it for a long time.
How Often Do Red Claw Crabs Eat?
In the aquarium, the red claw crabs should be fed once a day or every next day. You should also keep in mind that according to the size and age crabs will need more food. As we already discussed aquariums should be clean, if you feed crabs often it could impure water to live for crabs.
More Feeding Tips:
- If the aquarium has several crabs then Provide food to them in multiple spots to prevent competition.
- You should observe crabs eating habits, any change occurs you should notice it and try to find out the resolutions.
- To manage the balanced diet rotate protein and plant-based items.
Infographics For What Do Red Claw Crabs Eat?

Will Red Claw Crabs Eat Shrimp?
Yes, red claw crabs can eat shrimp if they are given a small size of shrimp to eat, they will certainly eat the shrimp. Sometimes it also has been seen that in some aquariums red crabs and shrimp share the tank without an issue. Still, it should be noted that Crabs are opportunistic feeders and may see shrimp as prey.
Do Red Claw Crabs Eat Algae?
Absolutely! Red claw crabs do eat algae, especially soft green or brown algae. Crabs are mixed feeders and they can take any opportunity to eat, hence can’t be relied upon as the sole algae cleaners in a tank but if they get Algae then crabs will eat it. In aquariums to balance the diet algae should be a supplementary part of their diet.
Do Red Claw Crabs Eat Snails?
Yes, red claw crabs can eat smaller or very soft snails which they can eat. Crabs can open the shells of snails and can eat them. If snails of smaller size get fed in the aquarium then don’t be surprised if you see crabs eating the snails.
Will Crabs Eat Shrimp in Aquarium?
Yes, crabs can eat the shrimp if they manage to eat them. It means the size of shrimp matters, if crabs can manage the size of shrimp to eat then it will eat them certainly.
Can Red Claw Crabs Live in Freshwater?
Red claw crabs are not real freshwater species. While they can tolerate freshwater for some time, if they live in freshwater for a longer time, they will lead to poor molting and even death. They live in brackish water conditions with a specific gravity of around 1.005–1.010.
How Often Do Red Claw Crabs Molt?
The Red claw crabs molt per 3–8 weeks, It clearly depends upon the age of the crab and the habitat they are living in. Younger crabs have more molting frequency compared to the adult crabs. This is very important for the growth of crabs and their generations.
Things to take care of when crabs are molting:
- Provide them plenty of hiding spots in the aquarium.
- Do not try to fasten the process of molting manually, and do not try to remove the exoskeleton of crabs.
- Do not change water frequently when crabs are molting.
How Long Can Red Claw Crabs Stay Underwater?
Well, We all know that the red claw crabs are aquatic, they need to access both land and water. They can go underwater for few hours but crabs must come to the surface regularly to breathe through their modified gills.
Very Interesting Facts that You should know:“
Frequently Asked Questions (FAQs)
Q: Can red claw crabs eat fish flakes?
Yes, the red claw crabs can eat fish flakes, but flakes are not their primary diet. They should be combined with sinking pellets and natural foods.
Q: Do red claw crabs need a land area in the tank?
The red-clawed crabs need a land area in the tank because they are semi-aquatic creatures. They live on land surface as well as in water.
Q: How big do red claw crabs get?
They typically grow up to 4 inches, including their leg span.
Q: Can red claw crabs live with guppies or other fish?
They may coexist temporarily but are likely to attack slow, small or bottom-dwelling fish.
Q: How can I tell if my crab is molting or dead?
When crabs are Molting, they hide and appear soft afterward. If unsure, gently observe for movement or leave it alone for 24 hours.
Final Thoughts:
Understanding the dietary and environmental needs of red claw crabs is key to a healthy and enriching aquarium setup. They are curious, hardy creatures but require proper care, a well-balanced diet, and a habitat that mimics their natural ecosystem.
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