I live in an area where there is alot of home building going on.Depending on the distance to the main beams I have seen that they can be placed in different configurations room by room since there is usually one or two 2 layers of plywood sheathing over them! Even though My Tank sits on a wall that is right on the main supporting beam and the joists run perpendicular under it, a builder friend still recommended putting jacks under the the area about two feet out from the beam that in fact supports the upper floor and roof of the house.Again we are talking about just around an extra ton of weight with the tank, stand,water, rocks, and substrate.
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