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#1
04-06-2014, 02:19 PM
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for how simple and cheep it would be I would add another one, don't need to go as heavy as the original one as it is supporting your ends of the silent floor system, but you could add one made of two 2x8's .
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*Some strive to be perfect.... I just strive. 
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#2
04-06-2014, 03:29 PM
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My 125 has 1 single 2x10 under it running length wise may not be ideal but I don't get any movement at all I wish my tank had that support guess I could upgrade but it's not going anywhere.
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#3
04-06-2014, 04:10 PM
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That extra beam will do nothing for stability, the one joist is fine for holding the weight, as others have pointed out it's a short span. If your hardwood was installed correctly (perpendicular to joists) you'd be fine however since for whatever reason it's not there is some potential for a rocking effect over the one joist. Again just to clarify the extra beam you sketched in will do absolutely nothing for this issue. That said there's an easy and simply solution, anchor the stand to the wall. Run a horizontal 2x4, or whatever, and screw to to your studs then screw your stand to that. For best results fill your tank half way and insure it's level before screw the stand to the wall.
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