My GS are proving to be very hardy. Reproducing very well with I think one, that I’ve found floating. I think some are at the very limit of what my SMB can eat. So we routinely have caught larger GS on worms when fishing for YP. I’m sure glad I stocked them as my FHM have disappeared.

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