7 more dead HSB this morning. I will start the diffusers back starting at 15 min at 4am and double it till I get to 3 hrs and then I am going no further with it. My fish kill started when I went to 4 hr run time so not going back there. To be honest I am not sure that I even want to run it at all during the summer months and my experience with diffused air after 4 years is to run it during the spring and fall when you really don't even need it because of the cooler water and higher DO numbers without the aeration. Can you tell I am not sold on diffused air?
I think George had a similar problem with diffused air and so he added a surface agitator and never lost any more fish. There's an old thread about it here somewhere.
