first filter media change

Hey all, its been six weeks and I think its time that I change out my media.
My question is this: should I rub off some of the bacteria from the old
media onto the new one before replacing, or should there be enough
beneficial bacteria already existing within the tank that will collonize on
the new media. Im using a aqua tech 10-20 power filter in a 29g tank. The
tank has been up and running for six weeks now and somehow is still reading
nitrate levels at being 20-30. Im assuming that this is due to the extended
time that Ive let the original media stay in there, to me this seems to be
the only possible reason that the levels are so high, ammonia is low-close
to non-existant and there are five large plants+12 fish that have all been
in there for the last six weeks..no new additions and no losses.Thanks for
any imput.-Brian




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