The Cannonball is a 3D printed cover for The Plank. It helps to prevent nuisance algae from growing inside the tube due to overhead lighting. It also reduces salt spray from coating Reef Jerky at the end of the barrel. Installation Simply rest the Cannonball on the top of the mounting platform. It can be easily removed to check the flo
4.5
26 ratings
5
4
3
2
1
Makes sense
Great idea to stop light from growing algae in the saturation tube.
B
Brook · July 27, 2026
Working great so far
C
Chris · July 21, 2026
Well printed. So far everything I’ve purchased from this company has been solid!