For the OP.
If you have an established tank, you can set up a new tank with dechlorinated water, let it run for 24 hours, then add some of the filter media from the established filter. The following day add some fish.
The filter bacteria does not die off if it's without food for a week. It goes dormant and comes back to an active level when there is ammonia available to process.
If you have an established tank, you can set up a new tank with dechlorinated water, let it run for 24 hours, then add some of the filter media from the established filter. The following day add some fish.
The filter bacteria does not die off if it's without food for a week. It goes dormant and comes back to an active level when there is ammonia available to process.