The title says it all.
Some people say that you shouldn't because you lose your beneficial bacteria. If you change the filter media, you obviously lose the beneficial bacteria. If you rinse the filter media off, will you still lose the beneficial bacteria living in the filter media? Same question goes for the sponge filters.
Some people say that you shouldn't because you lose your beneficial bacteria. If you change the filter media, you obviously lose the beneficial bacteria. If you rinse the filter media off, will you still lose the beneficial bacteria living in the filter media? Same question goes for the sponge filters.