It is cherax quadricarinatus, the most common crayfish. It can grow upt to 20 cm long. You can just keep it in a 2 ft tank (you can keep it in a 2ft tank for its whole life) with a hang-on filter and a pipe or wood for it to hide. Of course if you are keeping more than one, then you should put more hiding places. Also, these are quite good escapers, keep your tank covered if not they will crawl out.
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