falling through my floor?

[bullit67]

Well I have a 315 Gal system sitting in my kitchen do the math on that

One 265 Gal tank 500 lbs
stand Cap and sump 200 lbs
Live rock 250 lbs
Live sand 200 lbs
plumbing pumps and Mis. 150 lbs

and last but not least

315 gallons of water 3150 lbs

for a grand total of 4450 lbs

Yes 4450 pounds on a second floor I did reinforce the floor since the floor joist run the length of the tank so all the weight is sitting on 2 floor joist this is about the samr as standing a large family car on its end in the kitchen I was alittle nervous at first every time my cell phone rang while I was at work I would start sweating but one year later and still no problem