Firstly, please kindly refrain from SMS abbreviations as these are really really really difficult to read.
Most of these crayfish or lobster will grow big. Not sure on their species, but have a look here and see if you can find the information here.
http://www.shrimpcrabsandcrayfish.co.uk/
Regardless, I think even at this size, with consideration for further growth, it would be best to keep them in a tank which is no less than 2 feet in size.
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