Hi,
Greetings of the day from Siddhivinayak Solutionss!!
As the direction of Water is North as per vastu principles, Also Turtle and Fish are related to water so the aquarium should be kept in North direction and the 2nd option for the same is East Direction
Regards,
Vishnuprasad
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http://wwwsiddhivinayaksolutionss.plisweb.com/