Update, as of noon on Wednesday, November 9th.
I arrived at the farm and found the tank to be in the midst of a massive algae bloom. Debris was everywhere. I threw in one pellet and "blam", a yellow perch hammered it. Then I threw in a nightcrawler and once again fish were nailing it from every direction. DO was measured at 9ppm so the water quality was OK otherwise.
It took me approximately 15 minutes to drain the water, all the while scrubbing the sides of the tank. The refilling took about an hour and the water looked just as perfect as it did before the bloom.
Surprisingly, the fish ate a nightcrawler immediately after the tank was cleaned. They seemed unphased by all the activity.
While the water was down I removed 108 of the smallest YP to reduce the BOD on the system.
My total number of fish is now 338. One perch was almost seven inches?!? Looks like I've got a cannibal.
