just brace it up any way i have a 250 g in my bedroom depending on the size of your tank and where your joists run its pretty simple go by 2- 4x6 pressure treated make sure you extend 2ft beyond the the tank both sides(from left to right) then for the width one 1 ft behind the tank and in front 1 ft beyond (front to back) run the 4by 6 opposite of the joists supported by 4 lolli colums those colums will support 10,000 lbs i never had a problem my floor will not even move alittle.you could park a truck on my floor and it still wouldn't move
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