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Adding Emerald crabs will bring charm to your aquarium. Emerald crabs are beautiful species and are found in varying shades of green. They are reef compatible. Emerald crabs need plenty of rocks and prefer to hide in caves. Emerald crabs are nocturnal and come out once the tank lights are off. A tank of size not less than 20 gallons is required. Emerald crabs are omnivorous and like feeding on green algae, dried sea weeds and meaty foods such as shrimps. Emerald crabs are strategic feeders. Dietary supplements such as calcium, magnesium and iodine can be used. It is vital to maintain the temperature of the tank at 72 to 79 degree Fahrenheit. The pH of the water should be maintained between 8.1 and 8.5. Like other crabs, Emerald crabs cannot tolerate copper based medications and varying water salinity. Emerald crabs can clean their environment by taking off the algae from the tank. Emerald crabs have the habit of chasing other Emerald crabs from their spot. It is very important to feed the emerald crabs regularly as they might scavenge other small inhabitants otherwise. Emerald crabs also require large rocky structures to hide. They can be used to control bubble algae species which make t aquarium look dirty. Hence they help in cleaning the aquarium.