The Emerald crab is nocturnal and hides most of the day in caves in reef rocks. #1. Like shrimps, these emerald crabs will shed their exoskeleton as they grow leaving behind a what looks like a dead crab. There are also some types of crabs that make great algae eaters in reef tanks. treesprite. After a closer inspection he wasnt moving funny, he was being eaten by my emerald crab. The goby shot off across the tank, turned a weird pale color and started sliming. Emerald crabs will generally eat leftover food, algae and things of that sort. Joined: May 23, 2013 Messages: 495 Emerald crabs will kill fish, that's why its best to get small ones. There is still some remnants of algae so its not like he ran out of food. Should I have crab … Its distinct, flat shiny green body and hairy legs easily identify the Emerald Crab. Some sea hares will eat bubble algae and nothing else. Below is a quick video of an Emerald Crab scavenging the bottom of … Unfortunately, these sea hares will reproduce enough to eat all the bubble algae, then starve and die, fouling the water. I have also caught the Emerald Crab picking at other forms of nuisance algae as well. Anyone ever hear of this. So I woke up today and was looking for all my fish in the tank and noticed my blue hippo missing. You can supplement their diet with seaweed/nori sheets which helps keep a happy crab from turning to fishes and corals for a meal. 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. Emerald crabs (Mithrax sculptus) and various sea urchins will voraciously eat bubble algae but will probably also eat expensive invertebrates like corals. 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). or was he just cleaning up the dead body? Now it's small bubbles on the rocks. I don't mind getting 2 or 3 emerald crabs but worried my tiger Pistol Shrimp will kill them. The most common species of crabs include hermit crabs, emerald mithrax crabs, and anemone crabs. After snail, crabs (actually, mostly hermit crabs) take the second place as reef cleaner. so did the emerald kill my hermits? Posted December 15, 2008. Anyone ever used this pair together without them killing each other? ChitownRomeo, Oct 18, 2013. I could see him actually pulling some meat out so I doubt it was just a molt. Either way, it is best to remove the molt or suspected dead tank as you see it to prevent any nutrient build up. Quote; Link to post Share on other sites. The Emerald Crabs are also scavengers and will also eat bits of food which have gotten away from fish or corals. I ask because I saw my emerald crab eating the pistol shrimp this afternoon! 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. Depending on your reef livestock, these crabs may not bother anybody. I have one small one and a week ago he reached out and nipped my Mandarin goby. Unlike many other animals, Mithraculus sculptus will eat bubble algae and helps clean your aquarium of these algae. Steve L Member. 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. The Emerald Crab is well respected for its scavenging ability. Mithraculus sculptus (common names: Emerald crab, green clinging crab), is a species of crab native to the Caribbean Sea. Then I saw him in some rock work moving funny. But sometimes is active during the day. It will enthusiastically feed on uneaten meaty foods and many types of nuisance algae. The tank is about a month old, and was established when I got it. From turning to fishes and corals for a meal Share on other sites got it just molt... Then i saw my emerald crab ask because i saw my emerald crab is nocturnal and most... Picking at other forms of nuisance algae i could see him actually pulling some out., then starve and die, fouling the water was he just cleaning up the dead body and! 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