Yeah, looks like a freshwater fiddler based on the large claw to me. Have an area where he can climb out of the water or else he will try to escape. Ask me how I know.
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Not a mud crab... maybe a different species of fiddler?
Sent from my GT-P5210 using Aquarium Advice mobile app
Unless there's completely another type of crab called a red clawed crab other than the ones sold at petsmart
Then he's defiantly not a red claw
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