Originally Posted by Coral Keeper
Can i put chaeto algae instead of the filter cartridge?
No, Cheato is not a filter, it just helps keep your nitrates down. You will still need some type of filter. But like I said, many replace the bio-balls with live rock rubble, because if you don't clean out the bio-balls they themselves can build up your nitrates, and you don't want that. Your filter pad can also build up nitrates so even though you'll need one, you will need to clean it out weekly (with the saltwater that you take out to do your water changes).