I'm very confident it would do fine as is. It is extremely sturdy and dead-on square. But I'm not done yet.
This is my second stand. The first was for a 110 gallon and I SERIOUSLY overbuilt it (rated to hold over 3000 lbs). I also made it to hold a 27" TV and a VCR. If looked fine, but after all that work and planning, everytime I looked at it all I could think was -> rectangular box with a TV in it and an aquarium on top.
I wanted to go a different route with this one.