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post #1 of 5 (permalink) Old 11-07-2011, 07:04 PM Thread Starter
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Cycling seeding question

It's been several years since I had to cycle a tank from scratch so I wanted to get feedback on my plan.

Once my new Eheim arrives I'll use of the media from the existing Eheim (on my 2-year-old tank) to seed the new Eheim. What I was going to do was just switch out about a third of the media, putting the well established media into the brand new Eheim and putting the new media into the well established Eheim.

Will replacing about a third of the old media with brand new media affect the well established Eheim's ability to filter properly?

Does this make sense??

I'll be doing a fishless cycle with ammonia if that helps.
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post #2 of 5 (permalink) Old 11-07-2011, 07:16 PM
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No, I do that all of the time. It should not affect your cycle. If I were you, I would add some hardy fish as soon as you start up the new filter rather than a fishless cycle. JMO
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post #3 of 5 (permalink) Old 11-07-2011, 08:06 PM
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Ya, with cycled media you don't need to really cycle and you can add fish right away. The bacteria we need on the filter media doubles in about 24hours, so even knocking it down a 3rd won't make a dent and it will reproduce fast. Its starting from zero to get a population of millions that takes a while. Starting from scratch, you have to go 1,2,4,8,16,32,64,128, etc. Its going to a while to get to a million with that happening each day. Say your population is at 3 million right now, you take a 1/3rd out, so you're down to 2 million, it can go up to 4 million in 24 hours.

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post #4 of 5 (permalink) Old 11-07-2011, 08:10 PM
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You don't need to do the fishless cycle. The whole purpose of the cycle is to build up the bacteria we need in the filter. If you have that, you can skip that. I would add the 1/3rd of the media and add a few fish and feed right away, then you are providing ammonia for the fish. Then add a few more fish each day so you don't overwhelm the filter and let it double over each of those days.

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post #5 of 5 (permalink) Old 11-07-2011, 11:04 PM Thread Starter
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Ohhh, I see. Okay then, thanks!
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