jibboo
Aquarium Advice Freak
I went from a 10g to a 55g. My friend ran the new filter in his 55g for a couple weeks. I then moved half the water from the 10g into the 55g along with the fish. Granted, I have well water, but I didn't have any problems. My fish were fine ... but of course they were kinda used to being in nasty water, since I was terrible at keeping up in the 10g. I remember testing a few times in the first week and my ammonia and nitrites were a non-issue.
So, I think running your new filter in an established tank will definitely help. I'm sure moving anything from an established tank should help.
So, I think running your new filter in an established tank will definitely help. I'm sure moving anything from an established tank should help.