Hi, I probably should, but I don’t. So far my filters have been able to keep the water pretty clean, and I would have to get a whole new filter to fit ceramics
It will depend on the type of sponge and strength of the filter, but sponges should last for at least 1 year. Some people keep the same sponge for 2-3 years, and it’s fine as long as they don’t get worn down and are cleaned regularly.
I use two different filters. They are both pretty cheap: 1) Submersible Aquarium Internal Filter 15W (amzn.to/3RQvyJS) [$22.99] 2) AQUA-ATL 480 GPH Aquarium Submersible Internal Filter (amzn.to/41Dwvsf) [$34.98]