Hello all I’m sure this question has been answered a million times but skimmed thru some threads and didn’t see an exact. I have a BioCube 32 and am using a sponge in place of protein skimmer. I know I will replace this monthly-bi-monthly but when doing water changes should I rinse it with my removed water or is it fine to just leave and replace...... also I use Chemi Pure blue which says to replace every 3 months so same question rinse it or just replace it?