I've not done this, and I tossed the plants and they're stands.
When I got my 10g back from my uncle (which looked like they'd been using it), it came with some of my old equipment and items, I tossed all the plastic plants. I noticed that some of them had been taken apart and had metal bolts attached to the bottom to act as weights.
I never used bolts for it, I dunno who did it, or if they were even my plants.
The bolts were rusted, and to me rust = nasty water = unhealthy fish = dead fish. So I tossed them without a second thought. The rust had worn off onto the plants as well.
Whats your thoughts on this?