Quote:
Originally Posted by whatcaneyedo
Not my tank, someone elses.
What I think went wrong:
We've been letting new saltwater sit for a month before each water change un-oxygenated in a nearly sealed container with a small powerhead. The seachem reef salt probably had a very low pH by the time it was used. The low pH shock likely caused the anthelia colony to crash which began the tank crash.
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This is pretty unlikely, the math won't line up. In order to trigger a pH shock like that the 30g from the w/c would need to be very very low, remember you have all that buffering capacity from the 100ish g of water still in the tank.
Chances are you'll never figure out exactly what happened but my money would be on a contaminant of some kind.