If you move a filter straight over from an established tank , you ' ll more or less instacycle the new tank because you ' re taking most of the bacteria and moving them straight over . There may be minor disadvantages if the established filter cannot turn over the water thoroughly , so for filtering certain areas you ' re relying on a newer notcycled filter , or overall don ' t have enough circulation . But these problems are mostly outweighed by more water volume being a good thing . OP , if you ' re not familiar with cycling look into it or at least move your old filter . But it ' s safe to assume that ' s the plan anyways <| sep |> Oh yes , I ' m always loughing so hard and constantly bussing up ! <| sep |> Flyknit lunars 2