2, the placement of fish tanks. Generally, a triangular or rectangular fish tank is usually placed in the corner, and a round fish tank is best placed in the center of the building. It is best not to put hexagonal fish tanks in the office or at home. From the geomantic point of view, this hexagonal fish tank is considered to have a heavy suffocation. It's best to avoid the sun shining on the fish tank for a long time And the height of the fish tank should be moderate.