Cycling question! - Page 2 - Tropical Fish Keeping - Aquarium fish care and resources
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post #11 of 14 Old 06-12-2013, 09:11 PM
Okay, lets back up... fish and waste produces ammonia. Bacteria/Archea oxidize ammonia and produce nitrItes. Another bacteria/archea colony develops to oxidize nitrItes into nitrAtes.

Ammonia and nitrItes are not only toxic to fish, but also toxic at higher levels to the bacteria/archea that oxidize them. This is why water changes during the process are so very important. (higher levels of nitrates can also be harmful to fish long term which is one reason for routine weekly partial water changes.)

As 1077 points out, until you begin to see an increase in nitrItes that lead to an increase in nitrAtes, you have insufficient colonies for the N2 cycle.
So again, be patient and stay on top of the water changes to keep ammonia levels on the lower side.

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Originally Posted by zkessler View Post
Ok, so despite the nitrite level being 0 they ate still building in the tank? It's been over a month and I have not seen a decrease in the ammonia level yet.
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post #12 of 14 Old 06-13-2013, 05:55 AM
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This is a fishless cycle. My compliments.

In my experience, as long as the ammonia doesn't get >5.0ppm, your tank is going to cycle as quickly as it's going to. About the same for nitrite.

Get some fresh Tetra Safestart or Dr Tims One-and-Only (shipped fresh), and use the whole thing. Can't hurt anything.

Oh, and run the temp up >82*, turn the filter up and keep it dark.

Last edited by Hallyx; 06-13-2013 at 06:09 AM.
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post #13 of 14 Old 06-13-2013, 06:27 AM
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Quote:
Originally Posted by Hallyx View Post
This is a fishless cycle. My compliments.

In my experience, as long as the ammonia doesn't get >5.0ppm, your tank is going to cycle as quickly as it's going to. About the same for nitrite.

Get some fresh Tetra Safestart or Dr Tims One-and-Only (shipped fresh), and use the whole thing. Can't hurt anything.

Oh, and run the temp up >82*, turn the filter up and keep it dark.

OP states 4 cichlid's and a pleco which I assumed was/is the source of ammonia.

The most important medication in your fish medicine cabinet is.. Clean water.
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post #14 of 14 Old 06-14-2013, 08:54 AM
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Quote:
Originally Posted by zkessler View Post
Hello all,

... I did a 50% water change on the 4th because of really high ammonia levels...The ammonia had dropped to 3.0 .....I tested the water again prior to a water change to find ammonia at 6.0 ....
Ammonia was 6.0ppm before the 50% pwc. I had to assume that running these levels of ammonia for weeks would have sickened any inhabitants ...or worse.

Last edited by Hallyx; 06-14-2013 at 08:57 AM.
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