Cycling if adding new substrate sand

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Lamie

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Do I have to cycle the tank if I want to add a bit of sand to the bottom of my tank? (I thought I read that had to cycle)
 
If your tank is already cycled, there should be no need to cycle it again if adding sand. But say you add too many additional fish, that might cause a mini spike in ammonia and interrupt the cycle for a couple of days till the beneficial bacteria grow to compensate the increased load.
 
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If your tank is already cycled, no, adding sand doesn't mean you have to cycle again. Just make sure you rinse the sand well before you add it.
 

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