Second, you can't "cut your feet to fit your shoes", that is, put the fish tank directly on the ground without raising it; This pendulum will prevent the noble people from coming to the door, but it will cause bad luck.
Third, it is best not to have sharp corners in the shape of the fish tank. The most taboo fish tanks are made into triangular fire shapes, which are prone to mistakes and bloody disasters. Preferably round or oval or quadrangular, it is considered as a lucky pot.
I hope it helps you.