me either i see all these fancy google sketches...tried it and failed miserably lol id do better with the old paint thingy in accessories lol:)

Add a second diagonal beam to create an 'X'. One will be solid & the other would be 2 pieces, use 4 pieces of 4" x 4" x 3/8" angel iron with 2 - 3/4" bolts in each beam ( one above the other ) to connect it all together.

I think you'll be perfectly fine, I've setup a few tanks on tile before in similar situations and never had an issue. As long as the tile was installed correctly and it's not a delicate natural stone you shouldn't have any issues. With tile your subfloor has to be at least 1.25" thick so it's strong enough to resist any deflection from that kind of load. If the tank is about 16 square feet that's only around 60lbs per sq foot, just be sure the stand distributes the load evenly (foam would be a good idea).

If you're that worried about it bridge some small beams perpendicular between the two joists where the fish tank will sit and attach them to both joists and the subfloor. Putting in that yellow section won't help you though, the joists are plenty strong as is and your only concern would be the small sag from the tank sitting between them but like I said with that subfloor it's a non issue.

Its all about pressure, floors are rated in the amount of pressure they can take. Your tank has a massive foot print, for not that much weight. Lets say the weight of your tank with stand and rocks and everything is about 2000lbs, the foot print of your tank is (120" x 20") 2400"^2. So the load on your floor is 0.83 Psi, which is not very much at all.

My tall 190 Gallon tank has a load of about 3 psi. So I had an engineer come in and he said in my case it was required, and recommended a soultion.

Here is with all the heating pipe and drain http://www.canreef.com/vbulletin/pic...pictureid=4998

which makes it is more challenge to put small beams between the two joints.

What's the distance between joists?

The joints are I beam,

Distance between two panels of joints are around 18 inches, distance between 2 joints are 16 inches

You're laughing man, you have no issue, don't rip up your tile or do any modifications.

another option would be to build a raised platform that your tank sits on, say 2-3' in width beef it up so the joist runperpendicular to the joists in your floor, then youl span both joists with lots of support so no sagging.you can even then tile it or match it to what you plan to do with your stand .you wouldnt have to do anything like moving plumbing or ducts and you can still have a normal sized stand;)

yeah the subfloor is 1.5 inch thick. I can't increase the size of the stand because 13 inch is

width i can play with. The tank is there to divide our living room and kitchen.I think i will probably put some beam between joints so my wife can sleep at night better (not me lol)


Seth81, what formula are you using to calculate the PSI, my tank foot print is 120'' x 13'' to be exact? Tks