Advice on floor support for large tank

[sknoch78]

I am almost to the point of setting up my new tank. Total volume will be around 300g. I have done a tremendous amount of research and have read several threads about supporting the floor but few talk about putting a tank on the mainfloor with a basement. I am looking for anyone who has done this. Here is my situation, Main floor is supported by 2x10's with 3/4 ply and 3/4 oak floor. From the exterior wall where the tank will sit, the joist span aprox 12' before resting on the main cross support for the house. I have limited access in the basement as it is a completely finished daylight basement. I can open up the ceiling for any work to be done. What I cannot do is add support posts of any kind. So here is my dilema, how do I beef up the floor. I was thinking of adding additional josts and cross blocking as well as looking at beefing up the connection at the rim joist with hangers possibly.

Anyone have any good input?

FYI the tank will be 72x30x24 and the space it will occupy currently has 5 joists I believe.

Thanks in advance
Shawn

 

[Bebo77]

hth

http://www.reefcentral.com/forums/showthread.php?s=&threadid=792067

 

[sknoch78]

Thanks. I had read that thread. I guess that is what I am asking, Will sandwiching my existing joist provide enough support?

 

[sknoch78]

Going to play it safe and get a structural engineer to look at my situation.