Isn't this thread is moot, since in one of your last threads you realized you couldn't fit a 300G into your place. What has changed? Are you having a crane slide this 350G in through a window?
Below is my current setup:
I have a 270 gallon (6'x3'x2') on 2"x10" floor joists 16" on center. The tank sits parallel to a huge beam that is basically the foundation of the entire house. I live on the water and the house is supported by huge beams that come out over the water. The load bearing beams are 12' apart and the tank sits parallel to the wall that sits directly on this load bearing beam. It's been set up for about 18 months.



BTW, your tank will probably weigh more than 3,000lbs. Below is a nifty calculator I found using a google search. This doesn't account for a canopy/lighting, or the added weight of a wet/dry sump, extra filters, etc, so I think it's actually on the conservative side.
Results computed by FishTank Online January 19, 2009, 1:34 am EST
http://boonedocks.net/fishtank
Water Type..............................Freshwater
Material................................Acrylic
Tank Overhead Shape.....................Rectangular
Length..................................96.00 in.
Width...................................24.00 in.
Height..................................36.00 in.
Wall-thickness..........................0.75 in.
Volume..................................359.06 gal (US)
Tank Material Weight....................426.16 lbf
Water Volume............................346.10 gal (US)
Water Weight............................2879.96 lbf
Substrate Type..........................Medium Diameter Rocks
Average Substrate Depth.................2.00 in.
Substrate Weight........................264.29 lbf
Approximate Total Weight................3570.40 lbf
Room Air Temperature....................68.00 °F
Water Temperature.......................80.00 °F
Heating Capability Required.............221.97 W
Approx. Total Fish Length...............192.00 in.
Mass Required for 1 PPM.................1306.33 mg
Disclaimer: I'm not a structural engineer. I have no idea if your floors can hold that weight. I'm just sharing what my setup looks like.
Below is my current setup:
I have a 270 gallon (6'x3'x2') on 2"x10" floor joists 16" on center. The tank sits parallel to a huge beam that is basically the foundation of the entire house. I live on the water and the house is supported by huge beams that come out over the water. The load bearing beams are 12' apart and the tank sits parallel to the wall that sits directly on this load bearing beam. It's been set up for about 18 months.



BTW, your tank will probably weigh more than 3,000lbs. Below is a nifty calculator I found using a google search. This doesn't account for a canopy/lighting, or the added weight of a wet/dry sump, extra filters, etc, so I think it's actually on the conservative side.
Results computed by FishTank Online January 19, 2009, 1:34 am EST
http://boonedocks.net/fishtank
Water Type..............................Freshwater
Material................................Acrylic
Tank Overhead Shape.....................Rectangular
Length..................................96.00 in.
Width...................................24.00 in.
Height..................................36.00 in.
Wall-thickness..........................0.75 in.
Volume..................................359.06 gal (US)
Tank Material Weight....................426.16 lbf
Water Volume............................346.10 gal (US)
Water Weight............................2879.96 lbf
Substrate Type..........................Medium Diameter Rocks
Average Substrate Depth.................2.00 in.
Substrate Weight........................264.29 lbf
Approximate Total Weight................3570.40 lbf
Room Air Temperature....................68.00 °F
Water Temperature.......................80.00 °F
Heating Capability Required.............221.97 W
Approx. Total Fish Length...............192.00 in.
Mass Required for 1 PPM.................1306.33 mg
Disclaimer: I'm not a structural engineer. I have no idea if your floors can hold that weight. I'm just sharing what my setup looks like.