Ron,
Michigan must be a mecca for algae. My pond has more than last year of the same tenacious stuff. Easy to rake, but tons of work, also hard to separate and breakup once it is on shore. My pond is basically same size as your and I aerate as well. I have very clear water and a current explosion of milfoil this year (eurasian) I have some other noninvasive plants/weeds that came in naturally. I just keep up with the basics and hope it doesn't get worse from year to year. I'm sure I get some rain induced fertilizer runoff from my yard to the pond as it all slopes that way but I'm not crazy about filling my pond with chemicals constantly.
I only have minnows, crayfish, grass shrimp and tilapia in my pond right now.
I'm all ears on what else can be tried outside of raking.
I've read that bottom much traps nutrients. I'm tempted to bring in a big outboard, better yet a jet ski or something that can direct or recirculate a water stream under pressure to help stir up the bottom. The aerator helps but doesn't stir up the silt.
