Putting a new HOB filter on an established tank.
My ten gallon is in the process of cycling for the very first time and so far I've learned I hate the crappy TopFin10 filter I had laying around and want to replace it with an AquaClear 30. My question is when I want to make the swap, how do I make the change over without crashing the tank?
Run the two filters side by side for a while until I feel confident to remove the top fin?
Run the new filter with the media from the top fin sandwiched in there as well?