Old Filter Sponge

Make sure to keep it running.
Put it in a bucket and add some ammonia, or fish food, and test the water.
This way it will speed your cycle. (I guess to maybe 2-3 weeks)

What size tank are you getting?
 
Well roughly around 2 weeks I would say.
It also helps if you use the old substrate- and plants.

Good luck with your new tank! :)
 

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