Aces11
Aquarium Advice FINatic
Thanks everyone for the info!
Just an update.
I got a AC30 today and replaced my old whisper 20 that came with the tank. It hardly flowed out anymore so the new one seems like a raging river. I jam packed all my old media into the new filter so I have the AC sponge, as well as my old sponge AND my folded up cartridge and the biorings in the new filter.
But I do also have a question. How long should I leave the old media in the filter to allow bacteria to grow in the new media? I planned on leaving it in for about a month. Is that long enough?