Yes, that sponge should work well and can just be squeezed out every couple of weeks in tank water to clean the gunk buildup. Perhaps add a sponge filter that works off an airpump. Then if your main filter fails, you will not lose your cycle as the sponge filter will suffice to support beneficial bacteria. I do this in all my tanks.
Ditch the carbon. It is only needed if you want to remove meds after treating for a disease or other fish issue.
Yes, that sponge should work well and can just be squeezed out every couple of weeks in tank water to clean the gunk buildup. Perhaps add a sponge filter that works off an airpump. Then if your main filter fails, you will not lose your cycle as the sponge filter will suffice to support beneficial bacteria. I do this in all my tanks.
Ditch the carbon. It is only needed if you want to remove meds after treating for a disease or other fish issue.
As a bonus, should the need arise to use a quarantine tank, you can move the sponge filter over to avoid having to cycle the tank.
As a bonus, should the need arise to use a quarantine tank, you can move the sponge filter over to avoid having to cycle the tank.