Moving from a 30 Gal to a 55 Gal. - Page 3 - Tropical Fish Keeping - Aquarium fish care and resources
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post #21 of 32 Old 03-26-2011, 02:22 PM Thread Starter
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Actually the reason fish die in a cycle is because of the spikes in levels of ammonia, nitrites, and nitrates. Those are harmful to fish, they don't die because they are without them.

Taking the cartridge out of the 30 will harm the cycle because most of the bacteria is in the filter not the glass. Plus the water has to run through the bacteria in the filter to be cleansed of the ammonia and nitrites. So the filter is still necessary. Changes the filter media will completely restart the cycle.

Original poster, I would do what Thoth suggested.
Random question - But is the best way to change a filter cartridge (It's almost falling apart, so I can't just rinse it), to put a new cartridge in with the old one, and after a while remove the old one? That way the bacteria can build on the new one.
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post #22 of 32 Old 03-26-2011, 02:23 PM
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Oh you said that the reason they die is because the chemicals aren't being produced, which they are. If there are no chemicals being produced, then there can't be spikes.

But I see what you mean now.
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post #23 of 32 Old 03-26-2011, 02:25 PM
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Originally Posted by 29Kilo29 View Post
Random question - But is the best way to change a filter cartridge (It's almost falling apart, so I can't just rinse it), to put a new cartridge in with the old one, and after a while remove the old one? That way the bacteria can build on the new one.
If it will fit together. What I did was I cut a hole on the top of the new cartridge and take out most of the stuff in there. Then I put the sponge stuff and some of the other media from the old cartridge and put it inside the new cartridge through the whole. I basically cut up my old cartridge into pieces and put it in there lol.
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post #24 of 32 Old 03-26-2011, 02:28 PM
I use a canister filter and what I do there is just take out some of the big media and boom add some more and there I have a gold mine for cycling tanks.

38 gallon :
Pelvicachromis Taeniatus Nigerian Red not yet breeding pair
4 Pangio Kuhli
12 Hemmigrammus Bleheri
2 Botia Lohachata
1 Botia Straita
1 Ancistrus Sp.
6 Poecilia Reticulata




The Wet Spot Portland Oregon!!!!!!

ADA: Do!aqua Iwagumi 10 gallon size!
7 Clown Killies
7 Ghost shrimp
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post #25 of 32 Old 03-26-2011, 02:29 PM Thread Starter
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If it will fit together. What I did was I cut a hole on the top of the new cartridge and take out most of the stuff in there. Then I put the sponge stuff and some of the other media from the old cartridge and put it inside the new cartridge through the whole. I basically cut up my old cartridge into pieces and put it in there lol.
Lol, well I think there is enough room so I will try that.

Thanks for all the help
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post #26 of 32 Old 03-26-2011, 02:30 PM
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No problem :)
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post #27 of 32 Old 03-27-2011, 10:28 AM Thread Starter
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I know this is kinda late but I just put a new cartridge in with the old one and should the new one be infront or behind the old one, or does it not matter?
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post #28 of 32 Old 03-27-2011, 11:12 AM
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I cant imagine that it would matter

Last edited by VTonic; 03-27-2011 at 11:15 AM.
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post #29 of 32 Old 03-27-2011, 11:26 AM
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I would put it behind the old one so the old one doesn't block it from collecting the chemicals it needs to cycle.
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post #30 of 32 Old 03-28-2011, 04:26 PM Thread Starter
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If it will fit together. What I did was I cut a hole on the top of the new cartridge and take out most of the stuff in there. Then I put the sponge stuff and some of the other media from the old cartridge and put it inside the new cartridge through the whole. I basically cut up my old cartridge into pieces and put it in there lol.
Sorry to keep dragging you back to this thread :P

I changed the filter and all but I was just wondering how you changed yours? Looked like a better method.

You took part of the media out of the new cartridge and replaced it with some media from the old cartridge?
And what did you do about the hole in the new cartridge?
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