fishdance;965006; said:The reason why fluidised beds are such effective biological filters is the constant churning and aggitation of sand (media) where the nitrifying bacteria colonise results in continuous abrasion so the bacteria is constantly torn off. Luckily the sand is irregular shaped so some bacteria does remain and the bacteria is forever trying to re-colonise the media. This "young active" stage of growth is the most effective at removing nitrite and ammonia.
2007-07-05
Great information !!

How often do you recommend changing the media, or do you just top up when it is no longer up to the "Minimum" line when the filter is turned off???
Thanks,
tm