I just want to clarify - I in no way think it's the bulk chems that are responsible, I know tons of other people who are using the exact same ones from the exact same batches without problems, but I also know that I changed a lot of things in a short amount of time before this all began, which if this is a 'syncopated event' of a bunch of small changes working together to cause a serious problem, returning to the brands I was using before this all began is (at least I hope) a way to eliminate one avenue of stress.
In any case I got some more advice today and a 100% water change really does seem like the best way forward. I resisted it because I'm sooooo not set up to do that, but tomorrow I'm going to try and track down 6 more of the 55 gallon rain barrels to start making water.
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