amosf © Tim Fairchild wrote:

Well, when using old media I put quite a bit and just put the fish (not too
high load) in and go and find the tank is cycled almost immediately. It
might do a tiny minicycle, but generally everything is fine. It may take a
week to settle completely.

The bacteria should populate quickly with a good start from old media.

Thanks! In that case I think will let the parameters get to zero
NH3/NH4+ and zero NO2, do a water change and then add fish but not too
high a load as you suggest - seems very sensible.

Thanks again,

Muddy