sorry for your losses..it always sucks when you lose things unexpectedly or for no apparent reason.
to be honest, I don't think that the SG at 1.021 would have killed the inverts if it had been a gradual reduction.
I would look elsewhere for the cause personally.
I am not sure what to suggest beyond that.
good luck
Neal
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Way too much time and money has gone into this hobby....and yet, I CAN'T STOP
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