How can I replace a bio-filter cartridge for a Aqua Tech filter?
I got a used aquarium from someone. The aquarium came with a filter. The filter does not have any cartridges in it. How can I replace those. I know that you aren't supposed to change them after you start an aquarium, but where can I find a set to put
The carbon cartridges filters out most waste, but the biofilter is designed to host bacterial colonies to break down organic waste. You could probably get one from their website or a local pet store. Sponge filters should work just as well as they function