I guess it's a question of ... if it's not broken don't fix it lol.
Running an Eheim 2213 with the stock filter media (eheim noodles, blue pad, substrat pro, white pad and carbon eheim pad. Next month I will take out the carbon Eheim sponge ... with the extra space I'm wondering what I should replace it with since I will have some more room in the Eheim 2213.
1. A couple of 100 gram pouches of Purigen that I can rotate out and re-charge.
2. Filter Floss
3. Some extra seachem matrix, also have an extra 100 gram bag of Seachem de-nitrate - so a combination of both.
4. Any other suggestions?