I had a 20g sump on my 90 with no issues it just depends on what you want to do with it
Ps be sure you have the ability to remove the sump in case of a leak or crack. If I was you I'd reinforce the top beam on the other side of the stand and use that as the front for this very reason ie: no centre beam
The stand for my 180 as an example
And made a single panel to remove for easier workability
