Quote Originally Posted by David - WI
Did you check your pH with the "low range" test?

It looks like you might be "off the scale" on the low end... possibly it's much lower than 7.6?
Yes. It was right at 7.6 as well.

I did do three different water quality test over last night and early this morning, two from the grow bed discharge and one from the fishtank discharge. All were the same although the fishtank discharge was a little lower in Nitrates, I would have thought it would be the other way around.

I had no more fish deaths so far... although I only have two left in the sump tank... Perhaps the aeration is helping... seems weird to go a year and a half without it just fine, but then need it all of a sudden.