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Hey I got a question that I just thought of and need some help. I currently have a hang on filter on my 20 gallon extra high tank. I will be upgrading to a canister filter of some kind in next couple months. I am currently cycling my tank and it will be done before I add the filter. My question is will my new canister cause my tank to cycle again? I know that sounds stupid but i just want to make sure.

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The only way you will have another ammonia spike is if the HOB filter has become your main biological filter (which isn't normally the case); but with biological media (bio-wheels, rings...), it could happen. If you are concerned about it, move some of the media to the canister filter.

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