Fishless cycling: what to use in eheim classic 2217 - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-11-2018, 03:01 PM Thread Starter
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Fishless cycling: what to use in eheim classic 2217

Hi everyone, happy Sunday!

I am about to start my fishless cycle today with my new setup that includes a brand new Eheim Classic 2217 (600). It came with different type of media and I wonder if I need to have everything in the canister during the fishless cycle, or if I should remove some things from it. For example, I read somewhere that I should remove the carbon filter. Is that good advice? Anything else I should consider removing?

Thanks!
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post #2 of 4 (permalink) Old 03-11-2018, 03:18 PM
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You can run it just like it is. When carbon becomes no longer active... like after 3-4 weeks, just replace it with more bio media or purigen or sponges. Whatever you want really. If anything, the carbon will help keep water clear during the early "funky" stage. The whole carbon nutrient absorption thing is overblown, IMO. Maybe once plants mature, you may start to see some micro deficiencies but I doubt you'll have any issues the first few months using it.
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post #3 of 4 (permalink) Old 03-11-2018, 07:09 PM
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I would do it a bit different. I do not run carbon but lay it back as a fallback when I might want to use it. Those times are few but things like meds or if I get color are the times when I might want to use the carbon. Most of the time it does nothing that I can't get done easier/cheaper as the carbon is such a short term item. The tiny holes that make it clean things like meds is also the same thing that makes it useful life so short. They get full of gunk!
No harm in using it but then I don't favor opening and cleaning my filters every few weeks so I lay it on the shelf. The rest of the media should definitely be left in as they are the places where good bacteria should grow, so you want all the "apartments" handy in case somebody wants to move in!
Small point to mention? When first starting a tank, the bacteria is "thin" and not fully mature so be a bit slow and careful not to clean the filter too soon nor too hard. Let the little guys live in peace and get settled in before busting them too hard?
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post #4 of 4 (permalink) Old 03-11-2018, 07:54 PM
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Carbon is very helpful at STARTUP IMO. Not saying you need to continue its use, but it removes organics and toxins very effectively in the beginning stages when there is no bio-filter. Anything in the beginning to combat organic levels like water changes, carbon, etc. increase your chances of not dealing with algae.

ADA for example uses 75% carbon media at startup. It's much more important to open the tank clean then anything else. Its these organics that trigger the algae to become active. Once you have algae, then it's much tougher to get rid of it. I start all my tanks with carbon and they start up clean and somehow the plants grow.
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