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The roof has 20 square meters of free space. How to raise crabs at home?

Raising crabs in 20 square meters of free space requires water tanks, tarpaulins and sunscreen.

Because the sun on the roof is definitely the hottest, the breeding conditions in summer are definitely not very good, and it is too hot in winter. It is best to have some shelter objects. It's best to set up a rain curtain.