Probably too late now, but we don't charge anything to test your water, if you ever need a second opinion, feel free to come in.
Related to your post though, I would bet money on a O2 shortage, do you have a sump? If not, this is probably the cause, tanks without sumps can run fine under optimal conditions for years, but all it takes is that momentary lapse in stability to throw it off..... As others have stated, try and simulate the event and see what happens.
Steve
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