Didn't open the fx5 on my 120 for over 2 years. It had 2" of sand in the bottom. The bottom sponges were half saturated with sand to the point of almost being stone. The rest the sponges were filthy brown slime. The bio max wasn't plugged up except the bottom tray had some sand in it. The flow was never reduced, I don't run polishing pads. The tank also has a AC110 which was cleaned 4 times.
We do weekly 40% water changes.
Didn't open the fx5 on my 120 for over 2 years. It had 2" of sand in the bottom. The bottom sponges were half saturated with sand to the point of almost being stone. The rest the sponges were filthy brown slime. The bio max wasn't plugged up except the bottom tray had some sand in it. The flow was never reduced, I don't run polishing pads. The tank also has a AC110 which was cleaned 4 times.
We do weekly 40% water changes.