Floor - To brace or not to brace??

[Ryancw]

the fact that the place i've chosen for my tank bugs me that its running parallel with joists with only one landing beneath. There are two solid beams beneath either end of the joist only 6 feet apart from one another, but the tank itself is only 5' long and resting over one of the beams at one end.

I'm leaning towards adding a second laminated 2x6 beam under the other side of the tank.... am i worrying too much? I've calculated the whole system weighing in at around ~1400lbs