advice to help prevent a cycle in a tank move

[waynemah]

I just purchased an *established* tank and a day after the move all of the fish were dead. If I were to do it again, I'd move the livestock to an established location and spend a few days testing to ensure everything will be ok. I'm no expert but it doesn't feel good when you flush $500 down the toilet.

All of the water to be kept was pulled out before disturbance and new sand / stability was used . The tank is now in a wicked cycle.