I think it's not so much the weight of it, as the area that weight is distributed over. So putting a board of some sort would likely make it more stable and reduce stress points, just bc as pointed out carpet is soft.
My television weighs over 200 lbs and the entertainment stand it sits on is solid spruce and weighs over 100 lbs (and yes, I
have thought it would make an awesome aquarium stand...

) Together they're over 300 lbs and I'm on the main floor but my floor is wooden and over a crawl space; it's not level anywhere and creaks a lot and well that's the main reason I haven't gotten a bigger tank (yet) - but my tv has yet to fall through the floor in the two years I've been here
