Raw water, in nature, crabs survive in this way. Water can reach your mouth, not your mouth, not your eyes. After all, it is small and convenient to eat. Quite coincidentally, my family also has two. I feed the turtle food, which is special for amphibians. I just put it in the water and gently bounce it to the crab's mouth with a pen. When the crab is not very hungry, I don't eat it until 2 minutes later. But I was crazy hungry, and after 2 seconds, there was nothing. I have seen them eat. If the water is dirty, it should be changed, and so should the smell, otherwise the water quality is not good. Have more space and avoid fighting for status. Put some pebbles in it to make it easier for crabs to climb up. You can't stay in the water all your life. Crabs don't like light very much. Don't expose them to the sun. Now my two are living very well, and one of them is shelled.