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Results 1 to 4 of 4
  1. #1

    Join Date
    Mar 2013

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    Default Cycling with fish - a few more questions

    0 Not allowed!
    We've been cycling our current 20g tank for approx 1 and a half months now. Things seem to be going well. We have only one fish (a black molly).

    Well, actually, we have 5 because she gave birth (only have her and 1 fry in the tank - we moved the other three into a 2.5 gallon until we know what to do - pretty sure she ate some and we likely sucked a few up when doing water changes). We weren't planning on getting any more fish until our tank was properly cycled which I don't believe it is.

    So here are my questions : As far as cycling goes, shouldn't we have had some nitrate and nitrite readings above 0? They haven't changed at all, they have always been zero. We were having issues with ammonia, but we got that under control and is sitting at less than 0.25. We haven't changed our filter or gravel (only a few times we had to clean it due to a higher ammonia reading.) How do you know when your tank is entirely cycled aside from everything reading 0?

    Also, what should we do about the fry? Should we just leave them in the main tank? Take them to a fish store? Let them grow in the smaller tank until we can put them in the larger tank without them getting eaten or being sucked up by the filter?

  2. #2

    Join Date
    Sep 2010

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    0 Not allowed!
    Here's the issue..

    With only one fish [+ fry which makes effectively no dif] the BB colony you can maintain [Due ot the limited food supply] is so small that any additions will overwhelm them and you are straight back to cycling with fsh again until the BB colony grows relative to the new amount of food [Ammonia from fish waste and respiration] available.[Just so you know... Going this route can be an exceptionally long process.]

    Make sense?

    Imo you need to either return it and do a fishless cycle or get stock that more closely approximates the bio load you intend for this tank.

    Either one increases the food supply available for the BB and gets you more of them which is what you want.
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  3. #3

    Join Date
    Jan 2014
    Northeastern Florida

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    0 Not allowed!
    In other words, you NEED more than one fish in that size of tank to do fish-in cycling! We have a Hex 5/5 gallon tank and have TWO Rosy Red Minnows in it for cycling. The minnows will be taken out when the cycling is done and a male Betta and one or two Ghost Shrimp put in. Put a Moss Ball in when the minnows were put in. Our cycling time now has been one week and aquarium looks GREAT! Doing a small water change today.

  4. #4

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    Oct 2006

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