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I'm currently cycling a 20 gallon aquarium to prep for a school of albino cories, 1 albino pleco, and possibly a school of silver hatchetfish.

I read that cories like sand better, so I ordered some "caribsea instant aquarium sunset gold" sand to replace the gravel I have in there now.

My question is, if I replace the gravel with sand after the gravel has been sitting in there for over a week– does it start the cycling process all over and set me back?

I'm fairly new to this, so any information is greatly appreciated, as I want to do everything right for a happy and healthy tank. Thanks all :)
 

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Yup, filter houses most of the bacteria. I would suggest not feeding the fish for a few days afterwards as a precaution. Anytime you do anything that changes the balance I think it’s wise to stop feeding for a few days while things reach a new equilibrium.
 
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