On my last FX5 filter cleanout, I cleaned the outer sponges and all baskets accept the bio media basket which is on the bottom of the stack. The middle basket I now keep empty and the top backet I put charcoal. Is this a good setup? I am thinking about adding bio-media to the 2nd basket.
Also how often do you have to replace the outer filter sponges? Can you just clean them forever?
Also how often do you have to replace the outer filter sponges? Can you just clean them forever?