I don't have beavers as this appears to be a possibility but I did get several of my stones munched and busted via some large snapping turtles. Vertex said it is not uncommon as they seem drawn to the bubbles. With nothing but the air vibrations, I wonder if that drew this particular critter down in the much to the vibrating hose? Like Snub says, "just weird." LOL.

NE Ohio, 2 ponds @ 1.3 @ 16' & .5 ac.@ 6'. Aeration x 6 bottom diffusors, 2 HVLP fountains, Honey Hole habitat x 35 pcs, FHM, SMB, WE, RBT, YP, BG, HBG, CC (in newer WE/SMB pond only) 2nd 1/2 ac pond LMB, CC, RSF, SMB, BCP, CBG, HBG, FHM.