Emerald crabs will kill fish, that's why its best to get small ones. Mithraculus sculptus (common names: Emerald crab, green clinging crab), is a species of crab native to the Caribbean Sea. Anyone ever hear of this. If you do not have a ample supply of empty shells the hermit crabs will start to kill off your snails in search of new homes. I have also caught the Emerald Crab picking at other forms of nuisance algae as well. So I woke up today and was looking for all my fish in the tank and noticed my blue hippo missing. ChitownRomeo, Oct 18, 2013. Then I saw him in some rock work moving funny. It is often kept in marine aquariums to keep them clean, but the Emerald crab is known to attack and kill smaller tank mates then himself. #1. Its distinct, flat shiny green body and hairy legs easily identify the Emerald Crab. I could see him actually pulling some meat out so I doubt it was just a molt. Like shrimps, these emerald crabs will shed their exoskeleton as they grow leaving behind a what looks like a dead crab. The Emerald Crabs are also scavengers and will also eat bits of food which have gotten away from fish or corals. It will enthusiastically feed on uneaten meaty foods and many types of nuisance algae. Steve L Member. The Emerald crab is nocturnal and hides most of the day in caves in reef rocks. Unfortunately, these sea hares will reproduce enough to eat all the bubble algae, then starve and die, fouling the water. After a closer inspection he wasnt moving funny, he was being eaten by my emerald crab. The most common species of crabs include hermit crabs, emerald mithrax crabs, and anemone crabs. Either way, it is best to remove the molt or suspected dead tank as you see it to prevent any nutrient build up. There is still some remnants of algae so its not like he ran out of food. The tank is about a month old, and was established when I got it. Anyone ever used this pair together without them killing each other? I have one small one and a week ago he reached out and nipped my Mandarin goby. Posted December 15, 2008. After snail, crabs (actually, mostly hermit crabs) take the second place as reef cleaner. treesprite. Quote; Link to post Share on other sites. or was he just cleaning up the dead body? Mithrax crabs are one of the most commonly available types of crab, which are quite popular due to their algae-eating habits, especially the green emerald crab Mithraculus sculptus.They can be quite helpful, as they’ll rove around, out of sight for the most part, eating unwanted Valonia and Ventricaria (bubble algae). The goby shot off across the tank, turned a weird pale color and started sliming. Now it's small bubbles on the rocks. Emerald crabs (Mithrax sculptus) and various sea urchins will voraciously eat bubble algae but will probably also eat expensive invertebrates like corals. Depending on your reef livestock, these crabs may not bother anybody. Emerald crabs will generally eat leftover food, algae and things of that sort. Some sea hares will eat bubble algae and nothing else. Should I have crab … But sometimes is active during the day. My 29 gallon tank includes: 6 line wrasse royal gramma 2 emerald crabs used to be 10 scarlet hermits now its about 3 8 snails 45 pounds of LR If you do think it is the emerald, any ideas on how to … Often times, the emerald crab will appear back out of hiding after a few days…sometimes a week. so did the emerald kill my hermits? I ask because I saw my emerald crab eating the pistol shrimp this afternoon! Below is a quick video of an Emerald Crab scavenging the bottom of … The Emerald Crab is well respected for its scavenging ability. Joined: May 23, 2013 Messages: 495 There are also some types of crabs that make great algae eaters in reef tanks. 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