Well, I haven't stocked CC or LMB. I don't think my HSB, or SMB will do much with the bullfrogs. We swim in our pond a lot, and my wife won't get in if there's snakes, so the only predators I have for the bullfrogs are a GBH, or me..

I'm going to assume there isn't much known about water level changes, and its effect on spawning success..

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