White-spotted Hermit Crab (Dardanus megistos)

bulabr

Member
Dear friends

I would like to share my bad experience with one wrong sale from a LFS. I asked for the Dwarf Red Tip Hermit Crab and they sold me one White-spotted Hermit Crab (Dardanus megistos). HE IS NOT REEF SAFE. Please see below the pictures of this huge guy.

My particular experience for three days:

First day:
I thought that he was herbivorous, but he is not. He started to walk around the tank, scavenging the sand looking for food. He found out in the foot of my coral some small xenias:confused:. He ate them, but I didn't realize on time. After he went to my mini maxi carpet anemone and started to pull the tentacles and tried to cut them to eat without success. Later on he went to my Xenia and started to eat it. It was a big mistake:furious:. I took and put him inside the coast-to-coast overflow. BTW he is very strong.

Second day: I put him back to the tank, and I started to observe his actions. When I saw him to turn round one old mussel shell many time, I thought, let me serve one half fresh mussel shell for this guy. After the shell drop in the water, he ran after it, took and start to devour the mussel. He was starving at all. Some shrimps tried to enjoy, but it was impossible due to the White-spotted aggressiveness. He ate everything and after I gave to him two more pieces of the clam. He ate again. After I saw him calm, maybe to rest after the dinner. It was time to get him back to the overflow.

Third day: In the morning, for my surprise, he was in the tank. I don't know how he got back to the tank, but my first reaction it was in my Xenia. No damage at least. I gave another mussel to see his reaction. The same as before, ran after and started to eat as crazy. For that time I didn't know the real ID for my new friend. After some quick research in the web and forums, I found out and sad surprise. Why sad? Because he is not reef safe. He is beautiful, big, and looks like a monster hehe. I put him now in the sump(refugium). Let see if I can give to him a good life, or I have to look for another sweet home for this "monster" hehe:hmm6:

Some guy has had a good solution putting him in the refugium, and he takes care of him there, far away from the main tank.

I've seen some opinions about him like: "œ"¦very destructive, especially in a reef"¦", "œ"¦He will also attack and eat sleeping fish"¦", ""¦devastator crab is a good description for it (I know...I had one for awhile)"¦".

Some information about this crab:

The White-spotted Hermit Crab (Dardanus megistos) is a large, carnivorous hermit crab. It has hairy red legs covered with white spots with black rims. This hermit will prey on smaller inverts and fish and will not control algae. They are best kept in a species-only tank or a tank with larger fish. The White-spotted Hermit Crab has many other common names and may also be referred to as the Spotted Hermit Crab, Hairy Hermit Crab, Shell-Breaking Reef Hermit or Strawberry Hermit Crab.

Most hermit crabs are scavengers. Some smaller hermit crabs will feed on algae like nuisance hair algae while larger hermit crabs are scavengers and carnivores. Most hermit crabs are opportunistic - they will not actively hunt for a fish or active invertebrates but will prey on sick, dead, or dying individuals. Only the larger hermits like those from the genuses Aniculus, Dardanus, Peguristes, and Petrochirus are a real threat to healthy, larger tankmates or to corals. Calcinus, Clibanarius, and Paguristes are some of the most common "clean-up crew" hermit crabs for algae control and to eat leftover foods and detritus. Hermit crabs that are underfed are also a greater threat to tankmates like snails and other invertebrates.

Hermit Crabs have soft abdomens and use empty snail shells to protect their bodies. As with other crustaceans, hermit crabs must molt to grow. When they molt, they crawl out of their shell homes and shed their own hard shell to grow larger. As they grow larger, they need to find new, larger shells in which to live. Provide extra larger shells in the aquarium for the hermit crabs to move into. Hermit crabs without homes may sometimes make their own by killing the snail inside, or they may molt before they have a new shell, leaving them extremely vulnerable to predators.

Common Name: White-spotted Hermit Crab
Scientific Name: Dardanus megistos
Origin: Indo-Pacific
Aggressiveness: Moderate
Reef Safe: No
Invert Safe: No
Community Safe: No
Difficulty: Easy
Max Size (in inches): 8 (excl. shell)
Min Tank Size (in gallons): 55
pH Range: 8.0-8.4
Temperature Range: 75-82
Specific Gravity Range: 1.022-1.026
Diet: Carnivore, Scavenger

Best Regrads

Bulabr
 

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Good to know.
Question, though: How did you mistake this for what you wanted? He's most definitely not a dwarf anything, if my size comparison is correct. I'm assuming dwarf red tip is another name for dwarf red leg, and I've never seen a red leg in a shell larger than a quarter.
I'm comparing him to the sand grains- do you just have really fine sand or something?
 
I'm new in the hobby, less than one year, and I can see that the number of living creatures in this underwater saltwater world are amazing. The question could be, why the LFS(the store is big) didnt know about the difference?
I have fine sand and the shell of the crab is around 2in long and his body I believe that is around 1in.
 
My experience with these crabs was somewhat different.

I had one of these for several years in a 180 FOWLR with a few soft corals and shrimp. He never bothered a thing. The foxface used to drive him nuts and would chase the crab nipping at the antennae. The crab would wave his claws around like a person trying to shoo a fly. I had a humahuma that would chew on the crab's legs and the crab just shook him off and kept walking. I fed the crab silversides and clam strips twice a day. He took the food from a feeding stick or from my hand. When I finally gave him to an aquarium it was because he had outgrown the tank and was wearing a shell almost 10 inches in length. Kept knocking over the rocks while climbing.

I would NOT recommend them to others as as they can be very aggressive, will eat anything and are bulldozers which can decimate a tank.
 
When a crab is hungry it's going to eat whatever is easy for them to catch.. whether it's a sleeping fish or a pretty coral.

This goes for any crabs.. the larger the crab the hungerier it gets and larger the fish it can catch.

They are scavengers and like the OP said, other than uncontrollable bulldozing, he was harmless and well fed at the same time.

When you see a really hairy crab that should be a warning in general he's a bad guy.
 
I totally agree with what you have said here. I have had one for two years... I really love the guy but he is getting TOO big.. he makes a mess of my tank. But I fed him myself and feel very close to him. Not sure what to do about it which is why I joined this forum.
Sarah
 
I totally agree with what you have said here. I have had one for two years... I really love the guy but he is getting TOO big.. he makes a mess of my tank. But I fed him myself and feel very close to him. Not sure what to do about it which is why I joined this forum.
Sarah

He'll need his own tank eventually or you can give him to an aquarium.
 
I was at Petco and saw some of these, about the size of a quarter, including shell. I had no idea they would get that large. One was at the front glass, looking out. When i put my hand near the glass it would put up both arms wide and when moved away he would lower them. I thought it was the coolest marine hermit I've seen in person. If I had a tank I would have bought that particular hermit then and there. Would be great in a large display refugium. Someday.....
 
This animal is very interesting, and voracious. I put mine in the sump, because beyond to be voracious, he is strong. He turned a medium SPS coral upside down to see what was underneath. As a nocturnal creature, I was afraid he'd get one of my fish at night. He smells the food quickly when it falls, and rushes to catch it. Remember, he is carnivorous. I usually give mussels, clams, and silverside fish to him. he found a way using heater as a ladder, and jumped over the barriers to the other side where I have the water pump and the skimmer. He is always trying to do something "different".
Troublemaker is a good nickname for him hahaha. I like him, but he is not reef safe at all.

Bulabr
 
To revive an old thread, I bought one of these today, after having seen one in a friend's tank. I was at that friend's to try to figure out what was going on in his tank. He was losing LPS and softies. I saw this awesome hermit sifting his bright white sand bed.
So I go to me LFS to get RODI (don't waste your money buying an RO Buddy), see the same hermit in their live rock tank, so I get my water, have them bag up the hermit, pay and then go to chat with the fish guys. While I'm talking in the back of the store, several customers go through the line. I get done talking, walk to the register to get my hermit and water, and one of the employees had added my bag to someone else's, and poof, it was gone, the last one they had.
I have them just credit my house account.
So, I get home, and decide (rather late) I'd better do some quick research, as I have some sand sleeping wrasses.
Wow, the gods are looking down on me. Off to buy a lotto ticket.

TR : DR

Research first, I used up all the luck.
 
Eating

Eating

See the video this guy eating a small piece of mussel. He does a big mess hehe. He is living in my sump, but I'm thinking to sell him. I think he will be more happy in a fish tank. He is growing and growing, he is nice and inteligent. Today his size is around 2.5-3 inches. If you put one shell, bigger than what he has time by time, he will change it to grow more. I saw a picture in the internet of one the size of a man's hand.

https://youtu.be/Obh1h__y8n8

https://upload.wikimedia.org/wikipedia/commons/e/e3/Dardanus_megistos3.jpg


Bulabr
 
I have one that requires a 4" shell and it is amazing how fast they are, if I don't feed it every day it will try to turn a snail over ( I have the very large turbo's)

The crab is in a FOWLR with a 7" Miniatus Grouper, a few damsels Kenya Trees and some Mushroom corals. So far no issues
 
I made the same mistakes when I owned freshwater. I bought something that seemed cool and then next day everything was dead. Never trust the LFS!
 
See the video this guy eating a small piece of mussel. He does a big mess hehe. He is living in my sump, but I'm thinking to sell him. I think he will be more happy in a fish tank. He is growing and growing, he is nice and inteligent. Today his size is around 2.5-3 inches. If you put one shell, bigger than what he has time by time, he will change it to grow more. I saw a picture in the internet of one the size of a man's hand.

https://youtu.be/Obh1h__y8n8

https://upload.wikimedia.org/wikipedia/commons/e/e3/Dardanus_megistos3.jpg


Bulabr
This reminds me of the cookie monster eating cookies aha!
 
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