All my fish are dead

[corper]

I think I may have assisted in the death of my fish, but I'm hoping someone can tell me I'm wrong. I went to start pulling the dead fish out of the tank, when I noticed a piece of liverock had fallen infront of the powerhead blocking its flow. Yesterday when I was cleaning the garage I had to slide the tank over about a foot. The rock must have fallen then. At night my protein skimmer goes off for 6hrs. Thats when the kalk drip, phyto plankton and othe goodies go in the tank. It also would have been the only thing providing circulation . Someone please tell me I'm wrong.