Need to setup an instantly cycled tank?
Here is a quick method that works if you already have one or more established tanks. Keep on hand a spare sponge filter or media from a HOB (hang on back) in the event you ever need to expand, setup a hospital or quarantine tank.
When your ready to setup your tank, take your sponge from the existing tank and squeeze it out in a bucket filled with that tank water. That’s all good beneficial bacteria that you can use to startup a new tank! Put your new sponge filter in the bucket and squeeze it in the water to get the sponge filled with all that yucky stuff, I even just leave it there for a few hours to half a day but from experience it works instantly! Just go easy on your feedings the first week and you should be ok.
Interesting Fact: I once started 10 tanks on the same day all with new filters using this method. I actually poured the rest of the water evenly into each tank. Why not? I added my fish and was good to go!
As mentioned earlier go easy on your feedings & water changes the first week and you should be ok.