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Greetings, I used Sera bio nitrivec in my newly setup aquarium. I was told to use the recommended dosage for a few days before adding fish. Is it really prudent to use 6 cap fulls(38 gallon tank) every day for a few days to get the bio filter going before adding fish?

Thank you.
 

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Since you already have a cycled & mature tank clone the new one with bio media from the existing tank. It will amount to an instant cycle.
 

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The bio filter won't establish without an ammonia source. It needs to be fed to establish, and multiply.
 

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Never having heard of Sera bio nitrivec, I chased it down on Google. It seems similar to products like Nutrfin Cycle, used to break down sludge and remove ammonia. It does not contain the actual nitrifying bacteria needed to perform the nitrogen cycle. Is that what you're looking for?

Tolak is right, if you have an established, cycled tank, you can use some of thethe live bacteria in the substrate and/or filter media to seed your new cycle.

As for products that contain the bacteria resposible for cycling, look into Tetra Safestart, ATM Colony, API Quickstart, NiteOut, or Dr Tim's One-and Only (arguably the best). Just make sure the product is fresh and has never been frozen or overheated.

Dave's right, you have to feed the bacteria with ammonia, PURE ammonia, that does not foam when shaken. ACE hardware has it. Online, Dr Tim sells "pure" ammonia.
 
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