According to Feng Shui, the right side of the door is usually a fierce position, and placing the fish tank in a fierce position can suppress the fierce energy and bring positive effects. Therefore, it is appropriate to place the fish tank on the right side of the entrance door.
However, you should also be careful not to place the fish tank facing the door, so as not to create evil spirits and have a negative impact on the family's wealth and fortune.
In short, when placing a fish tank, you must consider the feng shui of your family and personal preferences to choose a suitable location.