Brick will grip the basketball in his mouth and "pop" it loose at the surface. Then he'll chase /splash it across the top. I don't mind the noise. I leave one of the lids up so he can bounce it higher. His previous "toys" were:
1. Rocks
2. Bigger Rocks
3. Heaters pulled off the glass
4. filtration pads pulled from the overflow
5. a giant ceramic open cave (17") he knocked over against the glass twice
So because of the nonsense:
1. All rocks 3" or less removed. A couple of boulders remain but are strategically placed under the plants (for the catfish)
2. Heaters are covered and now have super grip suction cups...Brick keeps trying, though...he slides and bumps the heaters sideways on the glass. Pushed one down so far the sensor was in the sand.
3. Filter pads are weighed with rocks inside the housings.
4. Ceramic cave removed! No point in being stupid...the thing weighs 2-3 lbs.
Given a choice, the basketball wins.