Frankly, even if one is a rat, a dog, a snake, a rooster, oops! a duck! or a chicken; there is no link between a fish tank and a Horse.
The only link is that a rat's worst pairing is a Horse: http://www.lovesigns.net/horoscope/areference/craho.htm
You may have to apply other Feng Shui techniques or if Feng Shui techniques are too far off; then, go by the gut or feel (feelings).

Quote

On 1/27/2011 4:11:22 PM, Anonymous wrote:
Hi, I am trying to decide
where to put my fish tank
outside my house. Kindly
advise which direction to put
it. I am a Horse. Thanks

Hi, I am trying to decide where to put my fish tank outside my house. Kindly advise which direction to put it. I am a Horse. Thanks