Aquascaper
Fish Aficionado
Your current filter is fine for your tank as it is, by replacing the cartridges with sponges you'll increase the filtration capacity, the same as putting a bigger filter on.
Nothing lasts forever so yes you will have to replaced it at some point but you're looking at years not weeks/months.
Eheim trumps all IMO![]()
So should i go for a Fluval 106, do you ever have to replace the media?