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Hi, I am fairly new to the amazing hobby of fish keeping. It has been a month and it is time for a water change, and filter clean up. Now I was wondering what to do with the black bio sponge (where the beneficial bacteria are). Do I dispose of it or do I keep it there forever?


Thanks Guys!!!

My platys and guppies appreciate your help!!:-D
 

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Keep it and just squeeze out the crud in some used tank water. You can reuse it as long as it's not falling apart. This is where some of your beneficial bacteria lives. If you throw it out and use a new one you may lose the cycle on your tank.
 
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