I did not want to use an algicide, but the soup was thick and we had hair algae on the bottom. Nastiness. I feared the pond might go oxygen-short if we let it get worse. So I bit the bullet and did it. I keep running out to be sure the fish are ok, but we are getting some major muck in the skimmer, and thus far the fish are annoyed, but don’t seem to be in great discomfort. If they started to have trouble, we would have them out of there and into a barrel of fresh water so fast…

What got us was the difficulty we had with a couple of bad topoffs, where we overfilled (my fault). It got the water out of balance, re ph and alkalinity, and that guarantees an algae bloom if the other resources are present.

Bummer.

We’ll be checking up on them all evening, and I’ll be sleeping with my window open, so if the pump labors and slows down their aeration, I’ll hear it and get up and clean the filter.