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post #1 of 5 Old 06-02-2009, 06:19 PM Thread Starter
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Tank cycling

Hi, I'm setting up a 29 gal tank about to start cycling. I think I want to do a fish in cycling process, but I don't know what fish to put in. I would like to end with a mature tank with:

~10 normal/ fancy guppies
~10 ghost shrimp
couple freshwater clams
good amount of malaysian trumpet snails

Using java moss, xmas moss, hornwort plants and sand substrate.
Are there any hardy fish good for cycling that won't bother other tank mates later on?
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post #2 of 5 Old 06-02-2009, 06:44 PM
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Hi Khanha,

I started up a 28 gal myself a good way to start the cycle is with a planted tank and make sure your ph is right before you add a couple guppies. See how that goes in a couple wks and slowly add more fish. The tank won't be fully established until 6-8 wks so becarful of bio-overload.

Tip: I believe 10 fish would be too much for a 29 gal could be wrong i'd ask around first, as guppies tend to breed easily you will have fry also to consider.

Let me know if this helped,

TigerFish
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post #3 of 5 Old 06-02-2009, 07:39 PM Thread Starter
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Thanks for the tips tiger, im going to let the tank cycle with just plants for a week before i add a few guppies in. Any other tips are appreciated =)
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post #4 of 5 Old 06-03-2009, 09:11 AM
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hello Khanha.

make sure if you getting guppies that you get all male guppies. if you sex them....you will have a ton of fry that you will need to deal with. All the fry with that stocking might be too much for your tank to handle.

There are hardier fish to cycle with, zebra danios are a popular fish to cycle with. I'm not sure of their compatibility with the other fish down the road though.
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post #5 of 5 Old 06-03-2009, 09:27 AM
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Reading this thread I think there might be some misunderstanding khanha3.

First, plants do not "cycle" a new tank, and having plants or not having plants in the tank has no effect on cycling. The cycling still has to occur. If you intend to have plants, put them in at the start; they perform other functions that are good, so might as well get them started.

Cycling will only start when ammonia appears in the tank, and ammonia comes from fish, decaying plant or animal matter, decaying fish food (not being eaten) or adding pure ammonia. If you intend to cycle with fish, you have to put in one or two small hardy fish. As you want guppies, get one or two guppies to start the cycling. Remember the advice from others, guppies breed rapidly and you will have more fish that your tank can accomodate in no time if you get a male and female (or a female that has already been impregnated).

Once you add a fish, the ammonia starts to appear and the nitrosomonas bacteria that feeds on it will start to appear. Nitrite is produced by the nitrosomonas bacteria, and this is also toxic to fish. It takes 5-9 days for this part of the cycle to work through, and before the end the second stage begins, when the nitrobacter bacteria appear to consume the nitrite. That part takes another 5-8 days. Nitrate is the resulting product of the second stage, and nitrate is relatively harmless to fish, provided you do your regular weekly partial water change of 30-50%.

You need a test kit for ammonia and nitrite, and should have one for nitrate as well. API makes a good test kit that includes these three plus pH which is also useful down the road. It takes anywhere from 2 to 8 weeks for a new tank to cycle. When you have readings of "0" for both ammonia and nitrite for several consecutive days, the tank is cycled for the number of fish in it. At that point, you can begin slowly adding new fish, a couple at a time. The bacteria will multiply to handle the additional ammonia and nitrite, but only if you add fish slowly and wait a few days in between each addition.

Hope this helps a bit. Ask us if you have any questions along the way, we're all here to assist each other.

Byron Hosking, BMus, MA
Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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