10-25-2008, 04:29 PM
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switching filters in cycled aquarium
Hi everyone -
When I first set up my 30g I had a 20g whisper filter on the top, and a submersible filter at the bottom of the tank.
Unfortunately, the latter has turned out to be a piece of junk, so now I've just the 20g filter for a 30g tank ... it's taking a while but I am starting to see traces of ammonia.
So it's time to put in a stronger filter - but of course, most of my good bacteria is in the old filter. I'm guessing I'll have to leave both running at the same time for a while. Has anybody else had to do this? How long do you usually give it before pulling the old filter out? (I'm going to use it elsewhere...)