Hi all, just need some advice just aqured a ufo 550 and about to set it up but a friend has just offered me a in use external filter matured over the last 2yrs if I put this in my new tank will the fresh water kill off all the bacteria in the filter? I can take some of his water to add to my tank if needed how would everyone go about setting it up will it be ready for fish or will it need to be cycled as a new tank set up?