I would highly suggest placing your tank so it crosses as many floor joists as possible. This distributes the load across more support. I had my 46 set up running parallel like you want to do. The floor didn't collapse or anything, but if anyone walked across the floor or bounced (got kids) in the other room, the tank would shake slightly. No big deal but bigger things could happen. I'm thinking you won't be moving your tank for a while and lots of things could happen in the years it will be set up. Top of my list would be earth tremor or god forbid earth quake. Best to have the most support possible.
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