One of the crabs is smaller than the other, the bigger crab is about 3 inches wide and the smaller is 2. The crayfishes, about 4 inches body length without counting the length of their claws.
The smaller crab does not get into each other, instead ( I am unsure if this is a female or male...the only difference between the two is that its colour is paler while the other is dark which made me think it was a female. ) he / she stays away or relaxes on the rock or hiding behind it.
While the bigger crab and the cray who tried to steal his territory kept getting into each other's way and they faught. However they seemed to be no injury, they only faught to where the distance between the two was big enough that the crab would just walk away. Defeated? No, none of them knew defeat as they would be ready to fight at any time again if disturbed and they did.
The difference between the two crayfish is that, the one who faught the bigger crab is red but not dark red as the one who sits under the bogwood digging his territory. As the lights went out for the night, he emerged...and went after the other cray that did not seem to know what defeat means and within 10 seconds I just do not know why I guess his claws are longer although the other's is wider...or maybe among their own species injury is possible? I don't know but the dark red was aggressive and beat the cray who did not know defeat right away without really fighting, and it sent him fleeing.
Then he faught with the bigger crab a little but the crab just wanted to move around and would push away if interrupted. But the Dark Red has such an attitude, the force is strong with him. Before I went to bed, I placed food again. Now the morning has arrived and they are all doing fine, without injuries. The problem is I should seperate them when they are molting or just alter the habitat making more hiding places. I will keep an eye on them.
...will keep you updated.