There is nothing about the above that is incorrect. Please tell me where i said sponges offer more surface area than ceramics? What said was that sponges are sufficient in the real world. Sponges come in many different densities and they are not created equally, a fine grade sponge will be utterly useless for mechanical filtration because it will clog in a few days. I suggested ceramic because they offer a decent balance between price and maintenance. They don’t clog like sponges, need little cleaning, have a decent lifespan and lots of surface area. They also don’t need to be cut to shape for the filter basket.
Fish tank filtration is about creating surface area to grow bacteria, having more surface area than you need in your filter gives you precisely zero benefit. You can only grow enough bacteria for how much ‘food’ (ammonia, nitrite) there is in the tank.
If the ‘food’ means 1 million bacteria grow, having the surface area to grow 20 million bacteria isn’t suddenly going to mean more bacteria is going to grow.
And before someone posts ‘yeh but biohome will remove nitrate’; no, it will not in a canister filter, any suggestion it will is snake oil nonsense. The bacteria which break down nitrates are anaerobic meaning you only get them in very low oxygen environments. Those conditions just don’t exist in canister filters which pump around highly oxygenated water at 5-10x the tank volume per hour.
Spending loads of money on designer filter media might make you feel good but it’s a literal waste of money.