Derpfish;4747910; said:The span of joists between the foundation to the right and the I-beam to the left is about 10 feet.
If you can get one end of the tank over the beam and support the other end well you should be fine long term.
Here is a link to one on ebay going cheap.What is an acro?
It is simply a steel support for removing lintels, supporting walls etc, you can leave it in place as long as you like.
Put a big chunk or wood at the top and bottom to spread the weight and screw it tight while there is no load on the beam.
You can also bolt them in place.
