Fish killed??? Power outage?

[jaketuff]

It would be sad if they died of old age...

But a mass killing like that of this morning is disturbing. I came down to the tank around dawn. Lights were in normal mode. All fish in the tank were dead... lying on the sand lacking color. SPS and LPS are fine. Starfish ok. All inverts ok. Pink Cucumber seemingly ok..... Culprits?

1. Power outage... hob was NOT running...but lights and canister was on...
2. Pink Cucumber detonated his bowels?

I left them at 12AM all were normal. Aside from one clown battling ich.

Right now all coral seems normal.... whew! Will post parameters later.