Okay so I currently own a fluval 407 and me being a newbie i didn’t know any better about the media. The media is the usually mechanical then bio, but then it goes with two carbon packets and then on the final one it is two carbon packets and a phosphorus remover. I’ve heard that these chemical removers aren’t necessary and my tank has been set up for about 10 days now with it being a week set up with fish. I was planning on replacing one of the media’s with some polyester fiber and the other one with maybe some more bio media such as bio balls and use purigen as my chemical if needed. Just some advice on when would be the best time to remove these media’s and should I do it with the water change or no. Just some help please