Cherax Quads usually get to around 6", and are opportunistic predators so any tankmates are a potential meal.
They are fully aquatic and don't require access to land,
oddly they are not! they are omnivores,(having the same, roughly, dietary requirements to a common pleco) not predators. and live on veg, for the most part (rotted to boot). younger cray need more protein than older ones. but unless taught to, cray do not eat fish. they will kill fish if they feel threatened. and they will then eat the result. but that's a long way from being a predator.
if this is your first cray. i would council not trying any tank mates. they can make good community critters. but a good understanding of the critter is a must, before you try it.
Redclaw cray need 20ukg tank per cray. i would not try a couple with less than 40ukg (and, for now, i would suggest you keep to one).
have a look at the TFF profiles. our own OscarWild has produced this:
Redclaw profile you will go a long way to find better advice.
quick one on sexing. males, when mature, have a red patch on the outside of their claws. you can tell if a redclaw is mature by its colour. redclaws go, progressively more blue after that.
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