I have two crayfish that are right now separated. When in the same tank. They want to kill each other and i don't know what to do. The larger of the two took both sets of antenna right off the last time. I moved one into the tank for almost 3 weeks by himself(the weaker one). Than saw if they could both be in. I turned around and within two minutes i have the larger on trying to kill the smaller. Is there any way to get them to get along and co exist in the same tank?