Tropical Fish Keeping - Aquarium fish care and resources

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-   -   cycled and ready (

mattsilkwood 07-16-2009 01:40 PM

cycled and ready
just checked both my tanks and its good news, ammonia 0, nitrite 0, ph about 7.3, im ready to go.

my 30 gal has been set up for about two weeks and my 90 gal has been going for 4 days!

when i got my 90 gal going the 30 was just starting to show nitrite, i had been doing alot of reading on the subject and went and got a friends used filter.
i cut it in half and put a piece in each tanks filter system.

the next day i had a nitrite spike in the 30, that lasted two days. i did 25% pwc on it those days.

the 90 never did spike, ammonia or nitrite, it raised slightly but nothing i would call a spike.

now for the hard part, adding fish slowly. i want them both full now!

i know i want some neon tetras in the 90, what are some small colorfull tankmates that would do well?

JohnnyD44 07-16-2009 09:22 PM

before you add any fish.....what are your nitrAte readings? usually these are off the charts by the end of a cycle and calll for a 80% water you have a reading?

mattsilkwood 07-16-2009 10:46 PM

in between 0 and 5

Byron 07-17-2009 08:56 AM

Mattsilkwood, i would suggest that the 90g is not cycled. No tank will cycle in 4 days under the circumstances you've mentioned. Using filter media from an established tank is fine, but without a constant source of ammonia in the tank the bacteria quickly die off for lack of "food." In the 90g a few fish in the tank from day one would have been fine since you added bacteria via the filter media and it would have easily handled a few small fish and multiplied accordingly as new fish were added.

As JohnnyD44 correctly pointed out, a rise in nitrate is the third part of the cycling process. The nitrate reading of 5 (if it was that high) was the result of the bacterial actions in the filter media.

I would now suggest you add a couple fish (small, and hardy) to the 90g and monitor the ammonia and nitrite. If there is bacteria still present from the filter media, it will handle the bioload from a couple of fish, and you can continue to add fish slowly. You will in effect be cycling this tank from the start. But in a 90g with only a few small fish this should be no problem. I would add a dose of Cycle (Hagen product) or Stability (Seachem product) which jumpstarts the bacteria and helps the fish.

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