must be the salt
Hi Dez,
I've been following your thread; you've done a great job. What I think would be causing it is the salt that was put away for years. My guess would be that some of the minerals chelated or something crazy and are now in the water, killing fish. Think heavy metals.
I'd do a massive/emergency water change, followed by another (dilution is an itch), and one more for good measure. Then try a damsel...
I am fighting cyano (still ayoung nano), so I hear some of your frustration.
all the best
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