Refugium question

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Hello I'm making the jump to a refugium for my current 55 with a cannister filter...I'm building a 20L for the fuge My question is how do I make the switch over from cannister to fuge without causing crazy parameter spikes. In other words do i just pull the cannister and hook up the fuge and hope for the best or run both for a certain timeset dont even know if thats possible I'm a little confused


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Most of your bacteria should be on the surface and in your rocks. You could take the filter media from the canister, rinse in salt water then put in a mesh bag in the fuge/sump. Then you can remove it slowly over a couple weeks. I’d also keep a bottle of prime on hand just in case. Also a seachem ammonia badge will keep the guess work out of it especially since it is accurate with prime in the water. Prime will give false positive ammonia readings.