hi snail guy, i know you hate me but i'll help u out buddy, crayfish eats fish, they are nocturnal so dotn bother them in the day, they will just lay there, they need some place to hide, like behind a rock, they will last 2 minutes out of the water, they will climb out of the tank through the air tube, the crayfish with one bigger claw is the boy and crayfish with 2 small claws are girls and if u keep 1 boy one girl they will no fight, but 2 guys will fight ,2 girls will not fight, if u have multiple crayfish make sure they cant climb on each other and be exposed to the water, when they grab u with there claw it WILL HURT LIKE CRAZY ! do not struggle or they grip harder, simply put them on a solid surface and stay still and they are almost invincible its hard for them to die, so u only need to clean there tank once a month, YOU DO '' NOT '' need a filter or AIRPUMPS and they dont need much room because they dont move much, they cost 2 dollars, always buy a big crayfish because they do not die as easily as the small ones, make sure the water level is not too full because if it is, more space for feederfish= harder to catch, sometimes in the morning u might wake up with just a fishhead floating in the water, take it out of the water,