Will it Mini Cycle?

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Galligak

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I have a 8 gallon tank with an internal filter that I want to take the media from for my sisters new 45 gallon tank, will that cause a mini cycle? We just put in some ghost shrimp a mere 2 hours ago and I really don't want them to die on us!
 
You mean take media from the larger tank to add to the 8 gallon? It should be fine. I'd assume maybe 20-30% of a filter cartridge would handle the new tank no problem. Don't be afraid to take a pair of scissors to the filter to get the size you need. If it's filled with carbon you can just shake it into the trash.

*Oh wait! I have it backwards.

I'd still vote the same though. 20-30% removal shouldn't be a problem IMO...just watch your levels obviously. A piece of media from an 8 gallon won't be a huge help so don't go crazy stocking it...but it'll introduce some bacteria to get things started :)
 
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