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that is a Xingu Freshwater Crab Brachyura gen sp.
natural habitat is the Xingu River in Brazil
adults reach 6cm(f) 5cm(m)
the ideal temp is 22-25C with a pH of around 6.5 - 7.0

the only other consideration for these is you may need to add a small amount of calcium to the tank for shell health. this can be done easily by either adding a cuttlebone once a week at night or by adding liquid calcium which should be available from any pet store that sells exotics (snakes, lizards etc); alternatively the snailshop.co.uk sells it online (other places prob do too)

note that small or sick/injured fish may become prey for any crab.
 
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