I'm hoping I put mine down heavy enough. After reading your post bjm83, I'm thinking I may have tried to cover too large of an area with one unit. I marked the current water level on a 2x2 before I left earlier today. I'll see how it is next weekend.
9 yr old pond, 1 ac, 15' deep. RES, YP, GS, FHM (no longer), HBG (going away), SMB, and HSB (only one seen in 5 yrs) Restocked HSB (2020) Have seen one of these. I think that's about all I should put in my little pond. Otter attack in 2023
