Thanks guys. I guess it was just coincidence that none of the experts here had a comment. I�ve ordered some Cutrine to treat it. No odor, so maybe my pond won�t be the next Chernobyl. I�ll get some in a jar, and get it to MU.
Thanks again.
Jeff

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.