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I'm looking to change my substrate in my 55 gallon. My current plan is to do it in sections (quarters or thirds) using a small divider and waiting a week or two in between to allow the bacteria to build up in the new substrate a bit before I remove more of the old. Would this be an effective strategy, or would it be ineffective or even unnecessary? Would I be fine to just replace it all at once? Thanks for any advice or info!
 
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