Adding new substrate...cycle again?

puffermama

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Do I have to re-cycle my tank when adding a new substrate? Or will filter media, plants, & walls be enough?
 
I haven't added the new substrate yet, I would like to know the best way to do it...
 
I'm currently doing my community after botched plans with a puffer,

yesterday is 1/4th replaced and every few days i will continue to do 1/4th untill its changed out.

I did vaccume the gravel I was changing before removing it as a lot of debris starts floating around if you dont.
 

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