How long does a tank stay cycled w/no fish? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 26 Old 03-25-2010, 11:35 AM Thread Starter
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How long does a tank stay cycled w/no fish?

I really should know the answer to this question but I don't. A quick search gives conflicting answers. How long will a tank stay cycled without fish in it to provide what the beneficial bacteria need to survive? (Assume the tank has no plant life)

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post #2 of 26 Old 03-25-2010, 11:43 AM
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Hmmm, can't you just "feed" it with fish food to keep the cycle going? Just a thought.
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post #3 of 26 Old 03-25-2010, 12:04 PM
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I remember reading, a 1% daily die off of beneficial bacteria .
Don't have a clue if that info is even close to being accurate.
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post #4 of 26 Old 03-25-2010, 12:08 PM
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From what I've read the first day initial die off of bacteria is very small, just a few %, but after the first day it speeds up tremendously. How fast?, I never could find anything definite but I did see 50% loss after 3 days and after 5 days you might as well start over. Of course no one posted scientific research to back any of that up so it could all be BS.
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post #5 of 26 Old 03-25-2010, 12:15 PM Thread Starter
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Thanks for the info. I guess a few flakes of fish a day ought to keep it cycled. It's only a 10 gl.

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post #6 of 26 Old 03-25-2010, 02:20 PM
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Do you have an Ace Hardware store around you? They sell pure ammonia (no additives). It's the Ace Brand janitor strength. Cheap too.
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post #7 of 26 Old 03-25-2010, 02:31 PM
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I'd think very quickly. Bacteria has a short life span I believe and if they don't have food they won't be able to survive and reproduce. (I don't think the beneficial bacteria live too long with fish I think they just die and reproduce quick enough?)

I'd do the the flake food or ammonia :) Putting maybe as much flake food as ud normally feed your fish.... keep the colony nice and large. ;) But I think if water quality deteriorates too much they'lld ie as well.

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post #8 of 26 Old 03-25-2010, 02:43 PM
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Another technique that works well - remember to test for ammonia - is to use one cocktail shrimp per 10 gallons. Put the shrimp in a woman's nylon, weigh it down with a rock or the like and let its rotting condition seed your tank. Remove the remaining shrimp after approximately one month.
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post #9 of 26 Old 03-25-2010, 04:37 PM
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Quote:
Originally Posted by aunt kymmie View Post
Thanks for the info. I guess a few flakes of fish a day ought to keep it cycled. It's only a 10 gl.
and what are our plans for this 10G???

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post #10 of 26 Old 03-25-2010, 05:01 PM
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What about if you go from 7 fish to 1 in a 16g? Will the one still support the bacteria enough or will there be a dieoff still so that I'd have to slowly add the fish in again rather than just put them all back? I've been planning to put all the fish in my tank but my betta outside in a tub pond for the summer.
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