This kind of fish is characterized by fierceness and strong sense of territory. In other words, the same kind of fish is not allowed to appear in the area you have identified. If there is, there will be a big fight.
So the landlord can decide the number of fish according to the size of his fish tank. I personally experienced that the 1 meter tank at home, two small maps raised since childhood, felt just right, and there were two crocodiles.
This kind of fish is very greedy, so it grows quickly. If you buy small fish, don't buy more just because you were young at that time. It's hard to control when you grow up.
The scale of the map will present an irregular shape, similar to the map we see, so it has the meaning of doing a lot.
Finally, I wish the landlord great success and smooth sailing ~ ~