Basement reinfocement

[hillegom]

Originally Posted by Coleus

Was thinking of putting a LVL beem with two metal posts

What about putting two beams, either side of the tank from the foundation wall to the two green verticals. Either with your idea of using steel posts or drilling into foundation wall and installing hangers, the same to the green vertical posts.
Then you can install two or more beams right to left, between these beams with a hanger like the ones used here
http://www.ilevel.com/roofs/r_MicrollamLVL_beams.aspx
this way, you would not lose too much height in the basement
you would use 2x8 or 2x10s (more research needed here.

This would only hold up your existing floor joists. As mentioned already this would not support the plywood floor that the tank sits on.

[fishytime]

can you make the stand for the tank wider then it needs to be?....... it would distribute the weight over a greater area and give you some piece of mind......but really.....135 g over 10' shouldnt be an issue.....especially if the house is new and assuming the framers did the floor properly