I used pond liner material when I made the bed.
The pond was very low last year when I installed it. There are also reeds very close in deeper water for them when they hatch. Should help with survival rates.
[Linked Image]

2 Acre, Completed July 2022, CC,BG, Sept. 2022, LMB June 2023, GSF, YBH invasion in 2022. BG, CNBG, RES, 2025, TP seasonal.