STOP - Call a structural engineer!
Here is a story entitled...
"No Good Deed Goes Unpunished!"
I set up a 110G AG for my 73 year old mom in 2007. She liked my 125G and she said "one day I should set one up....!"
Being a life insurance agent... I said some day was yesterday...!
After losing the fierce battle for a larger tank she beat me down to a 110G... I had everything ordered within a week...!
Then one day I was over there getting ready for the arrival of the tank and I said....
OH F%$K....!!!!
The tank is going to be in the den and directly over the garage... specifically... over the windsheild of her lexus in the garage...!!!! The tank would be running paralle to the joists... I freaked...!!! There really wasn't going to be anything "Load bearing" underneath it....!!!!!!!!!!!!!!!!
110G High AG 18" x 48" tank 250+ lbs, about 900lbs of water, about 400+ lbs of TX holey rock, ($900.00), minimal gravel 10lbs, 4 fluval 405s (aprox 20lbs each when fully loaded) = 80lbs, AG modern stand, (no hood) all total it weighs more than 1500lbs!!!!!!!!!!!!!!!!!!!!!!!!!!
Luckily, I have a long time client Nic Cuoco, of Cuoco Structural Engineering and in 2007 he was a very very busy SE! I called Nic and he said for a house of that age... circa 1930s here in CT the "normal" working load for the floor would be 40lbs per sqft with an absolute max of 100lbs per sqft.
I was at...
8 sqft divided by 1500 lbs = 187.5 lbs per sqft!!!!!!! Minimum!!!!!!!
Note: The footprint of the the stand is actually less than 8 sqft*****
I asked what would happen if I did it the way it is....?
He said the floor would at somepoint, start to buckle, the joists would start to deflect, (twist) and that would just be the beginning... it would NOT get better or level out at some point. In fact, he said worst case... it "could" at some point, depending on the stand, cause the stand to fail because it would be on a "potentially" shifting sagging surface which it was definetly not designed for. Which could lead to point oading the tank and cause t to blowout somewhere.....
Then he said the unthinkable...!!!
Nic- John, why don't you just go with a tank half the size that you want...?
John- Nic... I ALREADY AM GOING WITH THE SMALLER TANK...!!!! I WANTED TO PUT IN A 180G!!!!!!!!!
Nic- Oh...
So Nic designed a simple engineered beam support system on special hangers connected to the crte block with Hilti bolts epoxied into the block.... Plus it was made so I can add the 180G in the future!!!
End result....
Structural design work = $500.00
Additional cost (including labor) of support = $2,500.00
Peace of mind knowing that the Lexus and African Cichlids will never ever meet...
Priceless!!!!!!!
Lastly, I was in Nic's office the other day and saw an old rusted stand for a 55G that one of his guys is bringing from his house to set up. I reminded him that he was in an older commercial building and that he could put in a much larger tank with no worries.....
He said this one is free... and I said and your fish will be too...!
Can you say Malawi...?
John