Emerald Mithrax crabs are primarily herbivorous in nature and are generally shy and inoffensive in the aquarium. Males have an elongated one that looks like a pencil while females have a more oval shaped one usually with stripes. To me, it looks like a pair of spoons clamping together. I just had an over acheiver. I have had a medium sized Emerald Crab in my 30-gallon tank for about 4 weeks now. I cuaght it eating the cherub angel about 20 minutes ago, a fish which was perfectly healthy and very active a couple hours ago. No - Emerald crabs should not be housed with clams. I would keep the crab and wait to see if the wrasses turn up. They are known to pick these off the rocks and consume them. Emerald Crabs (Mithraculus scuptus) are a very interesting addition to a saltwater tank. The size of your bubble algae problem will largely determine the amount of emerald crabs that your tank will need to get the job done. It’s just those rare exceptions and uncommonly cantankerous individuals you must be wary of, sir. Has anyone else heard of emerald crabs eating fish? _____ I put an emerald crab in my tank a couple weeks ago for the algae problem until the tang can go in the tank. Some will eat whatever they can get their hands on. What I have seen is the remains of 2 hermits that he has killed (haven't seen him kill, but has to be him). Emerald crabs are best identified by the tips of their claws. Password: Register: emerald crab. ckreidler24. By ASAP-Reef, February 11, 2014 in Invertebrate Forum. I have seen him once since I have put him in. Many crabs have hairy legs so that's not the best way to id them. Any crab with pointed tips on the claws should be treated as suspicious. An emerald has flat rounded tips on the end of the claw. Does anyone have and emerald? As the name implies, the emerald crab is green–but unlike the name–this crab does not shine like a jewel. Rather, the crab is perfectly camoflaged to blend in with the rockwork. ASAP-Reef ASAP-Reef New Community Member; 7 posts; February 6, 2014; Posted February 11, 2014. Threads Tagged with emerald crab: User Name: Remember Me? I had emerald, sallylightfoot, peppermint and a fire shrimp shrimp all together in a 30 gallon without any problems. Any crab bigger than its tankmates could end up being a problem. He'd claw if anything got close but was so slow the shrimp would still walk right over him while feeding dodging the claws. I would say that 9 times out of 10, Emerald Mithrax make fine tankmates for seahorses and cause no problems at all. Reports vary with these crabs, sometimes good and sometimes bad. 8: 1,167: General Reef Discussion : Emerald Crab Stocking. Last week I discovered that my gramma was/is missing. Seriously, I saw it ripping apart an acan and picking at a leather. I actually had a emerald crab take the lives of 4 different fish before I figured out it was him that was killing them. Page 1 of 2: 1: 2 > Threads Tagged with emerald crab : Thread / Thread Starter: Last Post: Replies: ... emerald crab and snail problems. I never had a problem with emeralds and fish. 03-08-2015 05:28 PM by ckreidler24. Each one has its own personality some are very outgoing and have no problems being front and center in the tank while others will hide and make you think they have disappeared. Mithrax crabs have dull claws that allow them to scrape algae from your liverock, and are good at removing bubble algae, hair algae, dictyota, some species of caulerpa, and other complex macroalgae. Even if the crab did eat the fish, they were likely dead before it … Emerald Crab Problems Emerald Crab Problems. You might get pinched but, on the belly of the crab is what's called a girdle. So to say they are opportunistic is an understatement in my mind. To reduce the problem of Valonia (bubble algae), many people recommend the Emerald Crab as the solution. Emerald was the smallest of the three. But most likely the shrimp died and the crab found it. They do however have their quirks and it is best to be cautious when adding them. I have had luck with doing it, only if I made sure that the Emerald crab was a female and not a male. I had an emerald that I loved, but it started eating corals. The emerald crab, Mithraculus sculptus, is a quiet, shy and fun to watch member of the reef clean up crew (CUC). Emeral Crab Problem. Reply to this topic; Start new topic; Recommended Posts. I've seen them consume bubble algae, as well as decimate a troublesome spot of Caulerpa. So I got an emerald crab 3 days ago. I've added them to my reef often, and results vary. Implies, the crab is green–but unlike the name–this crab does not like! 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