If I do a 50% water change, will my tank re-cycle? - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 14 Old 04-13-2008, 01:35 AM
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I do 50% water changes on my 45 gallon tank every four weeks without any change to my tanks cycle, the bacteria is in the filters and the gravel not the water. I even did a 80% water change once with no ill effects on my fish. It all depends on the type and size of fish. The tank has four large cichlids in it and they are still thriving after two years. :D

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post #12 of 14 Old 04-13-2008, 05:58 AM
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Hi tyler, you say that you overfed the fish? What are your current readings for ammonia, nitrite and nitrate? What sort of filter do you have, and how long has the tank been running for?

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post #13 of 14 Old 04-13-2008, 06:12 AM
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hi
i would say that if you want to re-cycle then wash the filter out
completly,if you want to kill the benificial bacteria then use
tap water,and use tap water to clean everything else.
You will basically have a complete new system,and will go through
everything that a new tank goes through.
I would hope that you will re-cycle without fish,as i would have
thought you know that the fish will suffer if you do not,
so i won't ramble on about the poisoning.
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post #14 of 14 Old 04-13-2008, 06:15 AM
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Oh yeah, I'd forgotten that you had tried all those chemicals and stuff. So if you've gotten rid of all the fish you had (or they died off) then I'd say go ahead but if you still have then then re-cycling wouldn't be the step to take.

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