It's cycled and everything. But the power was out last night from about 1:30 til 5:30 due to storms. The filter is a Marineland Penguin. I heard it when it turned back on at 5:30 and it didn't sound like it needed to be reprimed to start it. Normally, when we do water changes and turn it off, when we turn it back on, it has to be reprimed, so I am assuming that meant it didn't "dry out" but being as I couldn't check for sure, I can't really say. I plan on checking my parameters closely for a bit regardless, but I was wondering if it really would have affected it? I turned the bubble wand up though, to offset any loss of O2.