Welcome, fellow Iowegian! My place is just south of Grinnell, and my pond is 2.5 acres. It's very old, so highly eutrophic at this date (i.e. it wants to turn into a meadow). I've been working on reversing that natural aging process all ponds go through since 2015.
My initial two cents is re-think the BCP (black crappie). I have them (they were already in my pond when I purchased our place in 2015). They are very difficult to manage i.e. keep from over populating and stunting. Lots of threads in here on BCP management. I found out the best/only effective management tool for BCP at my pond was the regular/recurrent winter kills that occurred before I installed aeration. Consider HBCP (hybrid crappie) if possible; you'll still get the tasty fillets but won't get over run with the early spawn of the BCP.
My other advice: if Bill Cody suggests something, it's really worth taking to heart.
I'd be glad to help you any way I could. Feel free to PM (private message me) or post questions and I'll chip in what I've learned from these guys.

"He who thinks he can and he thinks he can't, they're both usually right." - Wyatt Hendrickson, 2025 NCAA Hwt Champion