Swapping filters

Mudhead

New Member
Joined
11 Jul 2008
Messages
8
Location
Didcot, Oxfordshire
Hi all,

I've bought a new external filter in the view of replacing my internal one. Would it be best to; A, take all the media from my internal, put it in the external and run on the external or B, run the filters side by side for 'X' amount of time, allow the external to culture its own bacteria then remove the internal.

Cheers
 

Tim Harrison

Super Moderator
Staff member
Joined
5 Nov 2011
Messages
7,972
Location
UK
I'd just transfer the media. I've done it several times from main tank external filter to holding tank internal filter and back again whilst in between scapes and it works well.
The denitrifying capacity of the mature media isn't changing just the container it's in.
If your new filter has a greater capacity and allows you to add more media that'll become inoculated as well.
 

fishbro

Member
Joined
21 May 2018
Messages
141
Location
UK
Seeing as the external will be larger than the internal, you should be pretty well placed for space so would be best to put the old media in the new filter.
 

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