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Will a filter from a cycled tank automatically cycle a new tank?


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I have a 29 gallon tank with two fancies that has been cycled for over a year. I was running a tetra whisper 30 (145gph) and an Aqueon quiet flow 30 (200gph) on it. In both filters I use the cartridge (but remove the carbon) and also have ceramic media in there.

We just got two comets/commons that are only about 2.5 & 3.5 grams and have them in a 13g QT tub which I am currently using .3% salt and prazipro.

My goal is to upgrade the fancies to a bigger tank, (but I have yet to decide on the size), then put the little fish in the 29g.

In the meantime, I took the tetra whisper filter and put it on the QT tub with the cartridge and ceramic media still in it from the old tank. I also bought another Aqueon quiet flow 30 and put it on the main tank with new ceramic media and filter pad. Now the main tank has 2 Aqueon 30s on it with total filtration of 400 gph. One is an established filter and the other is new.

So, my question is this: Will the established filter that I took off the main tank and put on the QT tub automatically cycle it? Are the fish big enough to keep the BBs alive in the filter?

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I put a cycled ac70 on my new 55 and I did get an ammonia spike, but it went away quickly. I would suggest checking parameters daily, but you should probably expect a bump in ammonia or nitrites.

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I wouldn't expect a bump in your QT cuz those lil fish aren't creating much of a bioload. The BBs should keep up just fine. Some of them may go "dormant" since the bioload is less than what they are used to processing.

I would keep a close eye on the main tank, however. You just significantly decrease the number of BBs there while keeping the bioload the same.

Make sense? :idont

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I wouldn't expect a bump in your QT cuz those lil fish aren't creating much of a bioload. The BBs should keep up just fine. Some of them may go "dormant" since the bioload is less than what they are used to processing.

I would keep a close eye on the main tank, however. You just significantly decrease the number of BBs there while keeping the bioload the same.

Make sense? :idont

Yes that does make sense, but when I do a water change on the main tank I alternate replacing the cartridges and have never had any cycle bump. The ceramic media just stays in there. (I only had a small amount in the tetra filter because of lack of space, so the majority of the ceramic media remains in the Aqueon filter.)

I have also removed the entire amount of gravel in the tank at once and replaced it with glass stones. I was warned that doing that could cause a cycle bump but I never had one. I'm just assuming that your BBs that you sent me have super powers :flex: because I haven't added any more ceramic media to them and my tank is incredibly stable with all of the changes that I've done!

Edited by andry6
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You may be ok then. My BBs do have super powers after all. :flex:

:rofl

I would test for ammonia and nitrite in the main tank daily to every other day for a week or so to watch for any bump. The QT I'd test every 2-3 days but I don't expect any bumps in there. :D

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Thank you! I'll let you know if those little super hero BBs can stand up to this test!

:lol:

I have faith! :thumbs:

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Sounds good . Make sure to double dose the Prazipro if you are using it concurrently with the salt at 0.3% :)

I am :) Thank you! :) but only for the first two rounds, then I'll drop it down to .1% and normal dose of Prazipro for the next two rounds

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Sounds good . Make sure to double dose the Prazipro if you are using it concurrently with the salt at 0.3% :)

I am :) Thank you! :) but only for the first two rounds, then I'll drop it down to .1% and normal dose of Prazipro for the next two rounds

Don't worry Jared. I've trained her well. :lol2

:rofl3

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Sounds good . Make sure to double dose the Prazipro if you are using it concurrently with the salt at 0.3% :)

I am :) Thank you! :) but only for the first two rounds, then I'll drop it down to .1% and normal dose of Prazipro for the next two rounds

Don't worry Jared. I've trained her well. :lol2

:rofl3

I can tell. She obviously knows what she's doing :thumbup2:

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Sounds good . Make sure to double dose the Prazipro if you are using it concurrently with the salt at 0.3% :)

I am :) Thank you! :) but only for the first two rounds, then I'll drop it down to .1% and normal dose of Prazipro for the next two rounds

Don't worry Jared. I've trained her well. :lol2

:rofl3

I can tell. She obviously knows what she's doing :thumbup2:

Don't be fooled! :teehee I don't know all that much. :teehee

I only have one year under my belt and Lisa has been with me since day one, so she is right...she trained me well :thumbs:

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  • 2 weeks later...
  • Regular Member

You may be ok then. My BBs do have super powers after all. :flex:

:rofl

I would test for ammonia and nitrite in the main tank daily to every other day for a week or so to watch for any bump. The QT I'd test every 2-3 days but I don't expect any bumps in there. :D

No cycle bump on my main tank yet and it's been 9 days! :greenbanana::redbanana::nana:carrot::panana:tbanana So far so good!! :thumb:

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Seeing your question has been answered I just wanted to say, How exciting to be wanting to upgrade your tank. That's always fun. :)

Thank you! I'm looking forward to it since this will be my first (and probably not my last :teehee ) upgrade

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Seeing your question has been answered I just wanted to say, How exciting to be wanting to upgrade your tank. That's always fun. :)

Thank you! I'm looking forward to it since this will be my first (and probably not my last :teehee ) upgrade
haha I hear you. We kept upgrading, but my young teen daughter started off with a 5 1/2. (I know, Yikes!) But thank goodness we kept upgrading real fast. I only wish I was smart enough to realize how fast fish grow and just purchased the bigger tank first. Would have saved us so much time.
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