If you go with a heavy item on top, I'd put 1 on each end of the tank (2 total if that makes sense). I had a friend that used a brick but just put it in the center. His ball was still able to push up the edges (but it was a grown one, so it might be fine in your case).
Yeah, I would even go as far as putting one on each corner. (4 total)
Originally Posted by MootWorm
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