wire racks sturdy enough to hold tanks?

[Bogertophis]

The way I read it, I think they mean the total weight capacity is 350 lbs, not each shelf? That means 70 lbs/shelf, which sounds about right to me.

So weigh your tanks...if they are filled with sand & rocks, obviously they'll weigh more than some other furnishings would, but I'd guess they'll be fine.