The Halloween Moon Crab is originally from Costa Rica and is 2 to 2 1/2 inches wide and in captivity they can live as long as 10-12 years. These crabs are nocturnal and do most of their moving around at night. They are social creatures and do best in groups of two to four. But do not overcrowd them or they will fight and could seriously harm each other.
Here is an interesting video of a Halloween Moon Crab eating a cricket.
The Halloween Moon Crab has been called the most colorful crab on the planet because of the beautiful colors found on the crabs. In the wild these crabs are often observed carrying leafs and food into their burrows and climbing trees.
You can easily turn a 50 gallon aquarium into a great Halloween Moon Crab habitat. Keep in mind that you are going to need a small pool of water and it really should have a water fall falling into it or a small stream of water circulating through it to help keep the humidity in the crabs enclosure up.
These Halloween Moon Crabs which are part of the Hermit Crab family love to climb so you need to provide them with sturdy tree branches inside their enclosure to climb on. You can also take plastic pipe that is 3-4 inches across and 5-6 inches long and bury them in the enclosure floor to give them burrows like they would have back home in Costa Rica.
The temperature in your Halloween Moon Crab enclosure should be maintained at 75 to 80 degrees at all time and their really must be falling or running water in the crabs enclosure to keep the humidity up in the crabs enclosure.
Your Halloween Moon Crabs will do well on the commercial Hermit Crab Food but they also like crickets , meal worms , apples , peaches , and bananas. You can also give them small pieces of fish and chicken. The Halloween Moon Crabs are pretty docile and in no time at all once they get used to you they will reach out with a claw and take food from your hand.
The really important things to remember about your Halloween Moon Crabs are that their must be water kept running or falling in your crab enclosure to keep the humidity up and your crab enclosure must be kept at 75 to 80 degrees. Also remember that your Halloween Moon Crabs are nocturnal and they will be much more active at night.
Do you have a Halloween Moon Crab? Tell us about it now. Also post your comments , tips , or questions about Halloween Moon Crabs.
Gracie on April 30, 2019:
How can u tell if it is a male or female
Stephanie L on October 25, 2013:
How many can I put in a 10 gallon tank?
Stephanie L on October 25, 2013:
What is the smallest size fish tank you can have two in?
brody raef on August 09, 2013:
halloweenmoon crabs like to not be harmed but they do get very friendly as u keep them and they like to eat any kind of bug they also like to burrow under a piece of tree or plastic and they will pinch you if u don't harm them they wont they like to have an aqurium that's like a river bank and they have to have a pretty good size water pan and they like popcorn and you wont see them in the daytime only at night they do best in pairs of two or four and do not put them with any other aqurium animals have fun with your crabs!!!
babboon on April 30, 2012:
Ive had a moon crab for about two years. he is in a 40 gallon fish tank with fish in it. its full till about 3-4 inches. I have two floating docks attached to the side at the top of the water so he can climb out and chill. i also have a turtle hood ( which is just a really a box with a ramp) that gives him room to move out of the water. H e cruises both fish tank and top often. eats dried shrimp, mangoes, and sometimes my fish :( when he can cath them.
Thomas Byers (author) from East Coast , United States on April 16, 2012:
Save your crab and get rid of your hungry friend. lol
erik on April 15, 2012:
my crab is so alsome and i love him but my frend is redy to eat him wt should i do
Lanee on February 26, 2012:
My cousin bought me at Halloween Moon Crab ..And I like it but...its small and i have to keep it in a cage that my cousin Billy bought me too...Should i put it in my Cage and put water in it?
Chrissy on January 22, 2012:
Okay so i have two halloween moon crabs, I have had them for a couple of months. I woke up this morning and one of the crabs was in his water dish belly up. So i thought he was dead well when i went to get him out he started moving so i flipped him back over and he has been fine. Well it is night now and i was watching the same crab, still in his water dish he has like bubbles coming out of his mouth is that normal or what should i do?
ladybug on January 14, 2012:
im going to go buy a halloween crab tomorrow but i don't know how big they can get ?
dracon on November 28, 2011:
You should never just keep 1 crab and it is normal for you not to see them for a while after getting them. They do get stressed easy. I recommend a minimum of 3 crabs. and provide them with lots of hiding spots as well as access to fresh and salt water and make sure you use declorinated water. and keep the humidity level high around 70-80% and tempetures on avarege of mid 80's. Offer different foods i find my crabs like to eat fish food as well as fish and crikets.
Thomas Byers (author) from East Coast , United States on November 22, 2011:
How warm is your tank. Do you have a thermometer in it. It should be 75 to 80 degrees in their enclosure all the time. But keep in mind that the crabs are nocturnal. Are you sure they are not coming out at night.
Helaine on November 22, 2011:
I just got two moon crabs they dug a hole buried themselves and i havn't seen them since when do they come out
Derek Richardson on October 07, 2011:
A ten gallon is ok for one, but you can keep about four in a twenty. They can be territorial but the fights are just displays and no-one gets hurt.
alex on July 04, 2011:
is a 20 long big enough for one?
goodeid on April 07, 2011:
for all of you who are keeping just one, you should get another one they will probably live longer and be healthier if kept in a group
justenmartin on February 02, 2011:
looking to buy one. how can I go about it?
Darry on January 29, 2011:
I Just Got A Moon Crab Today And Boy Was He Mad On The Way Home But After A While,He Began To Calm Down And Within An Hour Or So After Gettin Him,I Stared To Hand Feed Him And He Took The Food Willingly.So Far As I Can Tell They Seem To Like Tomato A lot And Don't Put Too Much Water Inside The Cage Or They'll Drown.They Like Goldfish Too.
Sharky on January 19, 2011:
Hi, I want to grow plants in my halloween crabs tank. Is fertilized potting soil ok to use? Will the fertilizer harm my crab?
stevie on January 17, 2011:
How long do they live for? And what do they eat?
Suzi on December 09, 2010:
I had a soap dish crab, moon crab, and his name was Little Steve. I loved himso much I got a tattoo of him on the same shoulder he always sat on. He died 5 years ago... I think I might be ready for another one
adelin on November 06, 2010:
i have a halloween moon clown, and i just got it today, how do i get it used to me, where i can hold it and feed it with my hands.?
alex.t on October 07, 2010:
its an 55 inch akvarium large or small to a halloween crab?
Person on October 01, 2010:
I LOVE HALLWEEN CRABS!!! THEY ARE SO CUTE!!!
Thomas Byers (author) from East Coast , United States on June 19, 2010:
You should clean his cage or enclosure thoroughly with warm soap and water and be sure to rinse everything very well before you put it back together. If you keep his home very clean the mold should go away.
If your crab is burying food be sure to dig it up and remove the food. And give your crab only what it will eat. Don't put surplus food into the tank or enclosure.
Terah on June 19, 2010:
I have a Halloween Crab, and I love it, but for some reason I had white mold growing in the tank, and it started to get on him. How do I get it off him, and how do I keep the white mold from returning?
tasha on March 27, 2010:
the halloween crab is an amazing creature they must be highly intelligent as well... i wonder how big their brains are? hummmm