They also grow up to six inches wide and they need to be kept in a larger tank. That’s why it’s advised that you only keep a single Arrow Crab in a reef tank to avoid conflicts. The Arrow Crab can be aggressive with members of their own species or other shrimp and crabs that have a similar morphology. It has very long spider-like legs, and the males tend to be bigger than female members of the species. The Arrow Crab (Buy Online) has a head and body that looks a little like an arrow hence its name. They also don’t grow that large so they can be kept in almost any size reef tank.Īrrow Crab – Stenorhynchus seticornis Barry Peters CC BY 2.0 If there isn’t enough algae in your tank you can feed them seaweed and meaty foods on a regular basis to control their aggression.Įmerald Crabs do well in peaceful community tanks, and they tend to leave coral alone, and they won’t harass their fellow tank mates as long as they have enough to eat. They are also especially effective at controlling bubble algae that most other crabs won’t eat.Įmerald Crabs can become aggressive if they don’t have enough algae to eat. They do best in a saltwater tank with lots of live rock and a live sand substrate.Įmerald Crabs are one of the most voracious algae-eating crabs you can keep in a reef tank, and they make a great addition to any cleanup crew. The Emerald Crab (Buy Online) is a very popular reef safe crab species that are great at controlling algae. They also tend to leave coral alone which makes them one of the best reef safe crabs for a small to medium-sized reef tank.Įmerald Crab – Mithrax sculptus Mark Loch CC BY SA 2.0 Red Leg Cortez Hermit Crabs are also known as grazer hermit crabs, and they have a strong dietary preference for green hair algae and cyanobacteria. Red Leg Hermit Crabs will scavenge for leftover bits of food like most hermit crabs, and they love to eat multiple types of algae. They will grow to a maximum size of around 1-inch long, and they will do best when kept in at least a 20 to 30-gallon tank. Red Leg Cortez Hermit Crabs are an active and outgoing crab that does well in a peaceful community tank. The Red Leg Hermit Crab (Buy Online) has a vibrant red coloration that really stands out against a white sand substrate. Red Leg Cortez Hermit Crab (Clibanarius sp.) Magnus Manske CC BY SA 2.0 They are also voracious algae-eaters, and they tend to leave hard coral and soft coral alone, which makes them one of the best reef safe crabs to keep for beginners. It’s recommended that you keep a Blue Leg Hermit Crab in at least a 20 to 30-gallon tank (Buy Online) with plenty of shells for them to move into as they grow.īlue Leg Hermit Crabs constantly scavenge a tank for leftover food and detritus to eat. These brightly colored crabs also have a great personality, and they are a perfect fit for a peaceful community tank.īlue Leg Hermit Crabs will grow to be about 1-inch long when they reach adulthood. They also have bright blue eye stalks and blue mouth parts that protrude from their shell. The Blue Leg Hermit Crab (Buy Online) has bright blue legs with red bands near each joint. Blue Leg Hermit Crab (Clibanarius tricolor) RevolverOcelot CC BY SA 3.0
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