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Old 08-20-2018, 02:57 PM   #1
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Aquarium not cycled after 2 months

Hello,

I've been fishlessly cycling my planted 200l/55g aquarium since the start of June using ammonia. Within the first few weeks my ammonia levels were starting to drop off and I was beginning to see nitrites and nitrates, and apart from a brief period when my nitrites stopped reducing, everything seemed okay.

Around a week ago it seemed like my cycle was nearly finished as 4ppm of ammonia was being reduced to 0.25ppm and all nitrites were disappearing within 24 hours. However, since then my ammonia has suddenly stopped converting into nitrites and does not reduce at all from 4ppm for several days. As I am writing this post my ammonia is at 4ppm, 4 days after redosing.

What can I do to finish this cycle? I've looked online, and some people are saying I could use Tetra Safestart and stock a small group of fish to finish the cycle. What do you think about this?

Over 2 months seems like a very long time for my aquarium to not be anywhere near finishing.

Hope you can help,
Adam
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Old 08-20-2018, 02:59 PM   #2
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pH of the tank water?
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Old 08-20-2018, 04:18 PM   #3
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Between 8 and 8.2
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Old 08-20-2018, 07:34 PM   #4
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When was last water change? Might have used up some elements although ph looks good.
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Old 08-21-2018, 06:15 AM   #5
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A couple weeks ago, I was under the impression you werenít supposed to do water changes unless nitrites spike. Iím guessing thatís wrong?
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Old 08-21-2018, 06:56 AM   #6
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Imo water changes would be fine and quite often done to lower readings down from Ďoff-the-chartí to within test kit range. Also useful where ph drops too low (and useful elements have been deleted that bacteria need). As well there may be other elements used, so sometimes a water change kick-starts a stalled cycle.

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1 ppm ammonia --> 2.7 ppm nitrite --> 3.6 ppm nitrate.

For every gram of ammonia oxidised into nitrate 4.8 grams of oxygen is used, 7.14 grams of calcium carbonate is used (thus why pH crash can occur in tanks with to little buffering capacity).
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