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Old 08-16-2015, 01:43 PM   #1
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When to add new fish

My tank has recently cycled (within last 2 weeks). It has 5 zebra danios in it since day one. Yesterday, I put it 4 albino Cory catfish. How long is recommended to wait before adding more fish? 75 gallon FW tank, using Emperor 400 and Penguin 350 filtration. Thanks

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Old 08-16-2015, 06:21 PM   #2
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When new fish are added to a tank the BB have to multiply to cope with the extra waste, the time taken depends on many factors. However, if after a few days you have absolutely zero ammonia and zero nitrites then you are good to add some more fish. Any small readings and you should wait a bit longer.
Adding 4 more fish to a tank with 5 fish already in it will nearly double the loading so you need to be vigilant in the early days and water change as required.


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Old 08-16-2015, 06:25 PM   #3
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Ok. Thanks

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Old 08-18-2015, 06:13 AM   #4
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Just test your waters. When your ammonia, nitrites are at 0 ppm and your nitrates are in a safe range, it is time to add new fish!
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