Help! All the fish are dead...

[savingnemo754]

DannyBradley;335601 wrote: So when did it only become about temperature change? I'd call that the initial shock and the lack of biological filtration the finisher. The broken powerhead made it worse by lowering the amount of O2.

When fish are stressed they vent their waste, and with no filtration, ammonia will build up quite rapidly.

Thank you Danny. That is exactly what I figure happened. The temp shock wasn't enough to kill, but it stressed the fish and in their weakened state they could not survive the biological and powerhead issue.

It was a case of a lot of little things happening at once and creating an instant death trap.