Dear Cecil, Thank you for your prompt reply, here is the details: 1) the size of all the fish tanks same, it's 2'6" x 15". 2) Rearing fishes is more to hobby then "Feng Shui" but I do believe in "Feng Shui". And I scare that the location I placed will cause disadvantages to my family especially beside the altar and my house space is limited in the living hall. Ms Cecil, don't mind I ask, is there a problem for me or my wife if I rear fishes in my house? 3) The deity is a "smiling buddha", He is a small statue but I brought Him higher then the fish tank about 1 foot. Underneath is the Landlord. The distance between the fish tank and the altar is about 6cm apart. Thank you. Kelvin