My FHM population is sustaining, and I've had (60) SMB stocked for a little over a year. I've also got some GSH stocked from April of last year. When my feeder actually goes off, I see schools of smaller fish hitting the pellets that are along the bank.
I've caught several SMB this summer, all have been very healthy. Maybe I under stocked SMB, but I was so overstocked on YP I went with lower numbers.
(.75 acre pond, with current draught)

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