I need help, big time! We went away for the weekend and somehow the tank lost power, for 4 days! I came home and everything is dead, fish, snails, crabs, etc. Everything that was in the rocks is now floating around in the tank dead also, things I didn't even know where in there like shrimp, star fish, little centepede looking things, everything! So my question is, is my tank worthless now? Is the live rock and sand now dead? I did tests and obviously everything is off the charts, ammonia, nitrates, nitrites, all of it, and it smells like rotting fish, since, well, there were dead rotting fish in there. What do I do???!!! Do I have to start all over with new like rock and sand since everything that was living in there seems to be dead? Please advise.