First, condolences. This is suckage extreme.
Second, I don't see how this could be a cycle. Immediate deaths at that scale says "toxin" to me. Did you use any new glues, cleaners, solvents,e tc. during the build? Did something get dropped in accidentally during the switchover?
I've never <knock on wood> had to deal with this kind of tragedy, so these are just guesses. I think I'd have broken the tank down and set up a QT tank by now.
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