I set up a used 29 gallon tank last Thursday night. I cleaned (and rinsed) out the tank with vinegar, filled the tank with freshly treated tap water and started running the used HOB filter (Aqua Tech 20-40), which I made sure to keep wet during the transport, etc. I have since bought a new Emperor 400 HOB filter, which I will set up as the primary filter for the tank. The previous owner of the tank had a ton of fancy guppies in it, if that makes a difference.
My question is, how long should it take the tank to cycle using the old filter? I purposely didn't clean it or let it dry out. Should the water be pretty much instantly safe for my goldfish? I plan on running the new Emperor concurrently with the old filter to get things going.
Any help is appreciated.