Originally Posted by huma-huma
I wouldn't use tapwater ...just clean it in old tank water...and don't replace it unless its physically falling apart...no sense
The only reason you want to clean with tank water vs. tap water is to preserve the bacteria that is alive.
After 3 hours without power, I doubt that much bacteria made it. Even of those that did, they are surrounded with death.
The mini cycle is caused by the bacteria die off, and as such, you want to clean a canister filter completely.
Do water changes as much as possible to keep nitrites at or near undetectable and everything should pull through.