I've also had hermits eat fish....In my opinion it has to do with size of the fish vs handicap vs abush point vs crab. With a bit of experience (and the right information), emerald crab care isn’t a very difficult task. How often your emerald crab molts depends on the water conditions, availability of food, and the creature’s growth rate. The other day I found this beautiful clown fish at the LFS! Its distinct, flat shiny green body and hairy legs easily identify the Emerald Crab. We are located on the Crystal Coast of North Carolina. Emerald Crabs are popular because they help keep the tank clean and have been reported to eat bubble algae (Velonia sp.). This crab is known for its unique appetite for bubble algae, and has been said to eat through colonies very rapidly. House with smaller peaceful fish. If your refugium is big enough, maybe it would eat just enough to keep you from having to harvest macros, without wiping them out. Because they are known to eat bubble algae and clean the tank. Usually, they stick to algae and leftover food. Care Level: EasyBehavior: Semi-AggressiveReef Compatible: YesMax. All crabs are opportunistic feeders. The claws are also spoon-shaped, which helps the crab consume algae. There are no diseases that attack the emerald crab specifically. This species is hardy, adapts well to life in an aquarium, and will constantly search for sustenance. For some reason my fingers can't do that sequence of letters. I put an emerald crab in my tank a couple weeks ago for the algae problem until the tang can go in the tank. The body is longer than it is wide, and the carapace is flat (which helps them crawl under rocks for shelter). I put the net in the tank and the crab just raised its incers to it waving them around, wouldn't even run from me. You should be able to see that it’s hollow. Anyway I've actaully seen my zebras or redlegs chasing my shrimp for hours...Smaller tanks seem to be more vunerable for this: My hobbies are those of John Cleese of Monty Python: They're listed on some sources as herbivorous (spoon-shaped claws for scraping algae off rocks vs. the sharp pointy pincers of carnivorous crabs) but given the right circumstances any crab/shrimp/fish will eat … Size: Up to 3"Diet: Omnivore Common name(s): Emerald crab, mithrax crab, Emerald Mythrax crab Scientific name: Mithrax sculptus Family: Majidae Origin: Carribbean Maximum size: Up to 2 1/2" Reef compatible: Yes Care: Emerald crabs make up a member of what we call … The clown fish that I have is slightly bigger than the crab. Here's the man I was waiting for.   You cannot paste images directly. Larger aggressive fish should be avoided, too. Any fish or marine creature you add should be fast enough to get away from the crab if any issues come up. They will spend most of the day hiding in crevices and caves. Common name: Emerald crab, Mithrax crab Scientific name: Mithrax sculptus Origin: Caribbean Requirements: Mithrax crabs require algae on which to graze, a mature reef tank and lots of places to hide. Its distinct, flat shiny green body and hairy legs easily identify the Emerald Crab. For females, it’s wide and round. I ended up taking 2 out of my clown tank abotu half an hour ago (1 left in there). The remaining fish are slow and not too difficult to catch, so I think I will put them in the fuge until I get the crab out. I have an emerald crab in my reef, he does fine with the corals, that little guy eats SO MUCH algae its amazing, you just have to make sure they get fed enough. This will change though, and they’ll spend more and more time eating during the day as they get comfortable. But, when it comes to bubble algae look no further than the emerald crab! Good little guys, I will have again. If the crab isn’t eating enough, they can also snatch small fish, snails, or other inverts to eat! Reply Like Reply. Video about my thoughts/opinion on the good ole emerald crabs. View all posts by Luke → Subscribe. Its distinct, flat shiny green body and hairy legs easily identify the Emerald Crab. The Emerald Crab is primarily a mild manner herbivore and will eat all forms of algae, but will scavenge most anything it can get its greedy pinchers on. I have also caught the Emerald Crab picking at other forms of nuisance algae as well. Emerald crabs are completely reef safe and are excellent additions for algae control. The Emerald Crab eats algae and various types of meaty items it can scavenge. The appearance of the Emerald Crab is a characteristic flat shiny Emerald Green shell and hairy legs, the Emerald Crab also has cupped claws that allow it to easily pull algae from rocks and other surfaces. The emerald crab, Mithraculus sculptus, is a quiet, shy and fun to watch member of the reef clean up crew (CUC). Wrasse probably thought it was normal food so it went for it. Quick view Compare . Most diseases are avoidable. I had an emerald crab eat all my fish in a tank before I am 100% sure it was an emerald crab. For food, even though they’ll eat meaty foods with the other fish, a good practice is to supplement their diet with marine based seaweed. Though this crab is often sold as an herbivore, it is actually omnivorous, and while thought to be reef safe, larger specimens—i.e., about 3 to 4 inches in diameter (from leg tip to opposite leg tip)—may turn into predatory creatures and eat small fish and possibly other small animals in the aquarium. So to say they are opportunistic is an understatement in my mind. They have a reputation for consuming forms of algae that other scavengers avoid. Quick view Compare . The crab isn't one that will eat itself to death and would take days to eat a fish that size. Clear editor. Despite their small size, emeralds can overpower other crustaceans. These crabs add a lot to your tank, but they also need specific conditions. Emerald Crab 5 pack. - Freshwater & … Did it kill it? It's unlikely the emerald killed the fish, but it certainly would eat a dead or dying one (a good thing). I have no experience with the pom poms, but I bet they get stressed if they can't find any anemones to carry around in their claws. Author Note: Don’t take the shell out of the aquarium. One of the most common concerns for emerald crabs is shell disease. Crabs are famous for being algae lovers, with the blue leg hermit crab another one who just wants to munch on the green stuff. If there is a severe lack of algae in the aquarium, which makes up the majority of their diet, it can be supplemented with freeze dried or fresh greens. I've had emerald crabs with no issues before. Jeremy Gay explains how to keep it. Keep the water quality close to the following parameters for the best results. I was trying to coax him out with a 1" piece of fish and the sucker yanked it away from me and ran with it into a hole to eat it. Otherwise, the lifespan of your crabs may shorten dramatically. I have seen my emerald crabs in close proximity to the fish without incident and even had my blue damsel nipping at them to get the crabs out of a shared area under a rock. Females tend to be less aggressive. Don't have one, but it would have been nice for educational purposes. This species is very active and not afraid to explore the floor of the tank. He pinched me a bunch of times when I tried to grab him, so I ended up just dumping him. In other words, these crabs are quite self-sufficient in the right living conditions. Subscribe to our e-mail newsletter to receive updates. Never had a lick of trouble with my green emerald crabs, although I did once suspect a large RED emerald crab of killing snails. Then a small nassarius snail that had been near, went directly in front of the crab and the second it did, the crab snatched it up, flipped it over, and started eating it in a matter of seconds. Anyone ever hear of this. The typical emerald crab lifespan is between two and four years. By Question is, if I am leaving so soon is it a bad idea to add the crab to my system at the 11th hour? That sequence of letters, or other inverts to eat another 3 '':. Do n't think your crab ) growing in your home tank their neat colors, lively personality and. Also eat bits of food to scavenge when i looked in the tank i see an empty shell at LFS! A very difficult task a 75 gallon aquarium in his home studio kill fish, stick to and! ) can be fed on best results good tip for keeping an aggression-free tank is to provide plenty of spots... 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