Emerald Crab

Emerald Crab

The Emerald Crab is an amazing crab to add to any home aquarium, this is due to its ability to scavenge the tank and eat up any wasted foods and algae. This crab is known for its unique appetite for bubble algae, and has been said to eat through colonies very rapidly. In addition to the benefits you will receive in this crabs appetite, it also hosts an amazing appearance of a solid shiny green body and hairy legs. 

When seeking to house this unique crab, it is important to make sure there is always food available for the crab. Usually, this fish are bought to eat through bubble algae, but once the algae is eradicated the crab is then left starved. This can be overcome by adding meaty foods and herbivore preparations to the aquarium to make sure that there is always ample food available for the crab. 

It is important to make sure the emerald crab is fed well not solely due to it being hungry but because if it is not fed it may turn towards fish, corals and invertebrates in your aquarium to satisfy its hunger. However, when fed well this crab will make a great addition to your tank and is usually relatively peaceful. It is important to note that this crab will also not tolerate any copper medications and it will mostly kill it.

This crab will most likely be content with eating the algae in your aquarium, but if there is an insufficient amount present then it is important to feed them. This can be done by offering a variety of herbivore and meaty preparations. 

Care Level: Easy
Temperament: Semi-aggressive
Reef Compatible: Yes
Water Conditions: 72-78° F, dKH 8-12, pH 8.1-8.4, sg 1.023-1.025
Max. Size: 2½"
Colour Form: Green
Diet: Omnivore
Supplements: Calcium, Magnesium, Iodine, Trace Elements
Family: Majidae
Origin: Caribbean

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Easy to Care For
Easy to Feed
Peaceful with Others
Reef Safe

  1. These crabs do well in aquariums. Once, I put my finger on the tank. The crab would take either of its pinchers and touch the glass where my finger was! Talk about tricks!

  2. Our emerald crab is great scuttling around and through the live rock in our 50 gallon aquarium. He’s always picking pieces of algae off our rocks in and around our corals. He needs places to hide and often sticks one big claw out as a warning to keep our yellow tang at bay when he curiously approaches.

  3. IMO: I have emerald crabs and they do a great job of clean the live rock and substrate. However, if there is not enough food available they may go after other food sources. If that happens i would suggest feeding the crab seaweed to keep him good. It’s really up to you to decide.

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