2- Mixing the size of crabs, the small ones moult fast, and when they moult they are the most fragile, and they can easily become the food for the big ones
3- Regarding the rearing, you can pay attention to a few points, it's very simple:
One:
All about the environment, you should spread the dark color sand at the bottom of the container, it can give them a sense of security, and also put in water plants for them to climb and feed on. bottom sand, can give them a sense of security, you can also put into the water plants for their climbing and feeding, if there is no land then it is recommended to raise shallow water, over the back on it, if there is land exposed to the water you can choose to raise the deep water
Two: about the food-artificial under the don't feed the synthetic mixed feed, such as ham hogs and so on, all the oil is easy to break the water, you feed the earthworms or minced fish and minced shrimp meat on the OK you can use the You can use pots to raise it, water deeper or shallower does not matter, will not drown it. But it's best if the water is just soaked with shells. You can let it bask in the sun, not too long. The water can be used tap water, but only after a day in the sun.
Crabs are omnivorous.
You can feed them fish ah, whether raw or dried fish, they can accept. You may also feed them fish feed, red worms, shrimp, snails, mussels. It's best to feed them some grasses regularly, bitterweed, ilex algae, etc. As long as the feeding is ok,you don't need to worry about the rest. Crabs are very good to keep